1-Bromopropane is treated with each of the following reagents. Draw the major substitution product if the reaction proceeds in good yield. If no reaction is expected or yields will be poor, draw the starting material in the box. If a charged product is formed, be sure to draw the counterion.
a. with H_2 O
b. with H_2 SO_4
c. with 1 equiv of KOH
d. with Csl
e. with NaCN
f. with HCl
g. with (CH_3)_2 S
h. with 1 equiv of NH_3
j. with CI_2
k. with KF
Answers
Answer:
Explanation:
If we look at the structure of 1-Bromopropane; we will see that it is a derivative of alkane family by the the substitution of an alkyl group. The position of the Bromine in the propane is 1, making 1-Bromopropane a primary alkyl-halide.
Primary alkyl - halide undergo SN2 mechanism. This nucleophilic reaction needs to be a strong alkyl halide , such as 1-Bromopropane used otherwise it will result to a reactive mechanism if a weak electrophile is used.
However, the critical and the main objective here is to Draw the major substitution product if the reaction proceeds in good yield. If no reaction is expected or yields will be poor, draw the starting material in the box. If a charged product is formed, be sure to draw the counterion.
The attached diagrams portraying this notions is shown in the attached file below.
Related Questions
Solve: Turn off Show summary. Use the Choose reaction drop down menu to see other equations, and balance them. Check your answers and then write the balanced equations.
__Al+ __HCl→ __AlCl3+ __H2
__NaCl → __Na + __Cl2
__Na2S+__HCl→__NaCl+ __H2S
Please help!!
Answers
Answer: See below
Explanation:
To balance equations, you want to have the same amount of elements on the product and reactants side.
__Al+ __HCl→__AlCl₃+ __H₂
We see that there are 3 Cl on the products side and 1 on the reactants side, but there are 2 H on the product and 1 on reactant. To fulfill them both, let's put a 6 at HCl.
__Al+ 6HCl→__AlCl₃+ __H₂
Now that we have a 6 at HCl, we can fill in AlCl₃ and H₂.
__Al+ 6HCl→ 2AlCl₃+ 3H₂
All we have left is to fill in Al.
2Al+ 6HCl→ 2AlCl₃+ 3H₂
-----------------------------------------------------------------------------------------------------------------
__NaCl→ __Na+ __Cl₂
Since we have 2 Cl on the products, we must put 2 on the reactants.
2NaCl→ __Na+ 1Cl₂
With 2 NaCl, we can fill in Na.
2NaCl→ 2Na+ 1Cl₂
-----------------------------------------------------------------------------------------------------------------
__Na₂S+ __HCl→ __NaCl+ __H₂S
We see 2 Na on reactants, so we can put 2 on the products.
__Na₂S+ __HCl→ 2NaCl+ __H₂S
With 2 H and 2 Cl on the products, we can put a 2 at HCl.
1Na₂S+ 2HCl→ 2NaCl+ 1H₂S
Why does a skunk have very few predators
Answers
Answer:
because of their chemical defenses. (more info below)
Explanation:
Skunks have relatively few natural predators of their species. This is a testament to the effectiveness of their chemical defenses. Unfortunately, several skunks are killed when they cross busy roads at night. Deterrence is also not effective against a predator with a poor sense of smell like a Great Horned Owl.
hope I helped!
17. Consider the reaction shown and identify the statement that is not true.
825°C
CaCO3(s)
+ CaO(s) + CO2(g)
a.
This reaction is balanced as written.
b. The reactant must be heated for this reaction to occur.
c. The products are a solid and a gas.
d. Water must be present for this reaction to occur.
There are no solutions used in this reaction.
e.
Answers
Answer: Water must be present for this reaction to occur.
Explanation:
Decomposition reactions require breaking of bonds which require energy and thus all of the decomposition reactions are endothermic reactions.
The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) whereas liquids are represented by (l) and gases are represented by (g) after their chemical formulas.
The balanced chemical reaction of [tex]CaCO_3[/tex] decomposition is:
[tex]CaCO_3(s)\rightarrow CaO(s)+CO_2(g)[/tex]
The decomposition of [tex]CaCO_3[/tex] requires heat and leads to formation of CaO as solid and [tex]CO_2[/tex] as product.
Thus the the statement that is not true is Water must be present for this reaction to occur.
What is the [H+] concentration of blood, given the ph is 2.5?
Answers
Answer:
0.00316
Explanation:
You have to use the following equation:
[tex]pH=-log[H^+][/tex]
You are given the pH and need to find the concentration of H+. Plug in the given components and solve.
[tex]2.5=-log[H^+]\\H^+ = 10^{-2.5}\\H^+=0.00316[/tex]
The concentration of H is 0.00316.
354.5 g of chlorine gas (MW = 70.9 g/mol) is held in a vessel with a fixed volume of 70. L.
What is the pressure of the gas in atmospheres if it's temperature is 30.0°C?
___ atm
Answers
Answer:
1.77 atm
Explanation:
We have to check the values that gives the problem:
V= 70 L
mass =354.5 g
Molas weight= 70.9 g/mol
T=30 ºC
P= ?
We can find the moles of chlorine if we use the molar weight:
[tex]354.5g~\frac{1~mol}{70.9~g}[/tex]
[tex]5~mol[/tex]
Now, we have the moles, volume, temperature therefore we can use the ideal gas equation:
[tex]P*V=n*R*T[/tex]
We know the R value:
[tex]0.082\frac{atm*L}{mol*K}[/tex]
We have “K” units for the temperature, so we need to do the conversion:
[tex]30+273.15=303.15~K[/tex]
With all the data we can plug the values into the equation:
[tex]P*70L=5mol*303.15K*0.082\frac{atm*L}{mol*K} [/tex]
[tex]P=\frac{5mol*303.15K*0.082\frac{atm*L}{mol*K}}{70L}[/tex]
[tex]P=1.77~atm [/tex]
I hope it helps!
Acetylene gas is often used in welding torches because of the very high heat produced when it reacts with oxygen gas, producing carbon dioxide gas and water vapor. Calculate the moles of acetylene needed to produce of carbon dioxide. Be sure your answer has a unit symbol, if necessary, and round it to significant digits.
Answers
Answer:
2.25 moles ≈ 2.3 moles
Explanation:
Full Question:
Acetylene C2H2 gas is often used in welding torches because of the very high heat produced when it reacts with oxygen O2 gas, producing carbon dioxide gas and water vapor. Calculate the moles of oxygen needed to produce 1.5mol of water. Be sure your answer has a unit symbol, if necessary, and round it to significant digits.
First off, let's put the equation of the reaction sown;
C2H2 + O2 → H2O + CO2
Upon balancing, we have;
2C2H2 + 3O2 → 2H2O + 4CO2
So from the equation;
3 mole of oxygen is required in order to produce 2 mole of water vapour.
The question asks to calculate moles of oxygen needed to produce 1.5mol of water
This leads us to;
3 moles = 2 moles
x moles = 1.5 moles
x = ( 1.5 * 3 ) / 2
x = 4.5 / 2 = 2.25 moles ≈ 2.3 moles
Consider the following reaction where Kc = 77.5 at 600 K: CO(g) + Cl2(g) COCl2(g) A reaction mixture was found to contain 4.24×10-2 moles of CO(g), 4.48×10-2 moles of Cl2(g) and 0.114 moles of COCl2(g), in a 1.00 Liter container. Indicate True (T) or False (F) for each of the following: T 1. In order to reach equilibrium COCl2(g) must be produced. T 2. In order to reach equilibrium Kc must decrease. T 3. In order to reach equilibrium CO must be produced. F 4. Qc is greater than Kc. F 5. The reaction is at equilibrium. No further reaction will occur.
Answers
Answer:
The reaction mentioned in the question is:
CO (g) + Cl₂ (g) ⇔ COCl₂ (g), the equilibrium constant or Kc will be 77.5 at 600 K. In the given mixture, the moles of CO given is 4.24 × 10⁻² moles, the moles of Cl₂ given is 4.48 × 10⁻² moles, and the moles of COCl₂ given is 0.114 moles. The volume of the container is 1.00 L.
The concentration or Molarity can be determined by using the formula, concentration (M) = mole/volume (L),
The molarity of CO = 4.24 × 10⁻² moles / 1.00 L = 4.24 × 10⁻² M
The molarity of Cl₂ = 4.48 × 10⁻² moles / 1.00 L = 4.48 10⁻² M
The molarity of COCl₂ = 0.114 moles / 1.00 L = 0.114 M
The reaction quotient or Qc,
Qc = [COCl2]/[CO][Cl2]
Qc = 0.114 / 4.24 × 10⁻² × 4.48 × 10⁻²
Qc = 60.03
Thus, Qc is less than Kc. Hence, the reaction will proceed in forward direction so that equilibrium can be attained, that is, until Qc becomes equal to Kc.
Therefore, the product (COCl₂) will be produced, and the reactants CO and Cl₂ will get consumed.
1. The given statement is true.
2. The given statement is true.
3. The given statement is false. In order to reach equilibrium, the reactants must be consumed.
4. The given statement is true.
5. The given statement is false, that is Qc is not equal to Kc.
2. Convert 6.578 x 1023 atoms of magnesium to moles.
6.578 x 1023 atoms x
mol
atoms
Answers
Answer:
1.092 moles of Mg
Explanation:
Avogadro's number is a constant that define the number of particles (Such as atoms, molecules, electrons, ions) that you have in 1 mole. That means in 1 mole you have 6.022x10²³ of the particle in question.
If you have 6.578x10²³ atoms of Mg -and 1 mole of Mg contains 6.022x10²³ atoms of Mg-:
6.578x10²³ atoms of Mg × (1 mole Mg / 6.022x10²³ atoms of Mg) =
1.092 moles of MgThe number of nitrogen atoms in one mole of nitrogen gas are...
Answers
Explanation:
The number of nitrogen atoms in one mole of nitrogen gas are 6.02214179×1023 nitrogen atoms.
Hope this helps...
Lilly is doing a science experiment with a substance in a sealed jar. At first the substances molecules are moving around each other. What will happen to Lily substance if she transfers energy into the substance and causes a face change? after the phase change, the substance molecules will move...
Answers
Explanation:
faster and the substance will be a gas.
According to the forces of attraction and principles of phase change the substance molecules will move faster and the substance will be a gas.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
Learn more about forces of attraction,here:
https://brainly.com/question/2122941
#SPJ5
How many moles are in 87.62 grams of strontium?
Answers
Explanation:
it's one mole because the atomic mass is treated as molar mass and the atomic mass of strontium is 87.62 grams/mol
what forms of technology are scientists using to study El Nino
Answers
Answer:
a network of buoys.
Explanation:
It is operated by noaa. The buoys transmit some of the data on a daily basis to NOAA through a satellite in space.
Please balance the following equation: NH4NO3 ---> N2 + O2 + H2O
Please show your work, I keep getting it wrong and I don't know what I'm doing wrong.
Answers
Answer:
2NH4NO3->2N2+O2+4H2O
Explanation:
U have to ensure that they are equal both side s hope it helps
The reaction that takes place in a hydrogen-oxygen fuel cell is
2H2(g)+O2(g)⟶2?
Select the major product of the reaction and determine whether the reaction is exothermic or endothermic.
H2O2 , endothermic
H2O2 , exothermic
H2O , endothermic
H2O , exothermic
Answers
Answer:
H20; exothermic
Explanation:
A fuel cell is a device that converts chemical potential energy (energy stored in molecular bonds) into electrical energy. A PEM (Proton Exchange Membrane) cell uses hydrogen gas (H2) and oxygen gas (O2) as fuel. The products of the reaction in the cell are water, electricity, and heat.
The catalyst used in the industrial production of ammonia: Select the correct answer below: A. enables equilibrium to be reached more quickly B. increases the equilibrium constant C. shifts the equilibrium of the reaction to favor the products D. none of the above
Answers
Answer: A. enables equilibrium to be reached more quickly..
Explanation:
The catalyst can be define as an important ingredient may be a protein in the form of enzyme that is used to speed up the rate of the chemical reaction. The catalyst cause a transformational change in the substrate to produce product. The catalyst do not get consumed in the reaction. In the availability of the catalyst, the forward and reverse rates of the reactions will speed up this will allow the equilibrium to reach faster.
The total enthalpy of the products in a reaction is 0 kJ, and the total enthalpy of the reactants is 100 kJ. What is the ΔH for the reaction? Choose the correct answer. –393.5 kJ –100 kJ 0 kJ +100 kJ
Answers
Answer: -100 kJ
Explanation:
Heat of reaction or enthalpy of the reaction is the energy released or absorbed during the course of the reaction.
Heat of reaction is represented by the symbol [tex]\Delta H[/tex].
[tex]\Delta H=H_{products}-H_{reactants}[/tex]
[tex]\Delta H[/tex] = enthalpy of reaction = ?
[tex]H_{products}[/tex] = enthalpy of products = 0 kJ
[tex]H_{reactants}[/tex] = enthalpy of reactants = 100 kJ
[tex]\Delta H=0kJ-100kJ[/tex]
[tex]\Delta H=-100kJ[/tex]
Thus the ΔH for the reaction is -100kJ
Given that benzaldehyde is a meta- director, in the same Marvin editor draw all three resonance structures for the carbocation intermediate that results from STEP 2 in the electrophilic aromatic substitution reaction when benzaldehyde reacts with Br2 in the presence of FeBr3. If you do not remember the structure of the benzene derivative, consult the L3 complete lecture notes slides #21 - 24.
Answers
Answer:
The reaction of FeBr3/Br2 with benzaldehyde will yield a major product in which the -Br is attached to the benzaldehyde at the meta position.
Explanation:
In chemistry, resonance is a way of describing bonding in certain molecules or ions by the combination of several contributing structures into a resonance hybrid in valence bond theory. Resonance structures often explain the formation of certain major and minor products in organic chemistry reactions.
Aromatic aldehydes and ketones undergo electrophilic substitution reactions such as nitration, sulphonation and halogenation. Since the aldehydic group (-CHO) and ketonic group (-COR or -COAr) are electron-withdrawing, they are deactivating and m-directing.
In benzaldehyde, the ring becomes deactivated at ortho & para positions due to an electron withdrawing aldehyde group. Hence electrophilic substitution is favored at Meta position.
This implies that the reaction of FeBr3/Br2 with benzaldehyde will yield a major product in which the -Br is attached to the benzaldehyde at the meta position.
John Adams was the first US president to
Answers
Answer:
To live in the White House
Explanation:
While George Washington was in office, the white house was still in the stages of being built. Hence John Adams was the first president to reside and live in the White house.
Answer:
It's B to live in the white house.
Explanation:
Determine the boiling point of a solution that contains 70.6 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722 mL of benzene (d = 0.877 g/mL). Pure benzene has a boiling point of 80.1°C and a boiling point elevation constant of 2.53°C/m.
Answers
Answer:
Boiling point of the solution is 82.3°C
Explanation:
Boiling point elevation is defined as the increasing of a boiling point of a substance by the addition of a solute. The formula is:
ΔT = K×m×i
Where ΔT is change in temperature (Final T - 80.1°C), K is boiling point elevation constant (2.53°C/m), m is molality of the solution (moles of naphthalene / kg of benzene) and i is Van't Hoff factor (1 for Naphthalene)
Moles of 70.6g of naphthalene are:
70.6g × (1mol / 128.16g) = 0.5509 moles
Kg of 722mL of benzene are:
722mL × (0.877g / mL) × (1kg / 1000g) = 0.633kg of benzene
Replacing in boiling point elevation formula:
(T - 80.1°C) = 2.53°C/m×(0.5509mol / 0.633kg)×1
T - 80.1°C = 2.2°C
T = 80.1°C + 2.2°C
T = 82.3°C
Boiling point of the solution is 82.3°CThe boiling point of the solution is 82.21°C.
Number of moles of solute = 70.6 g/128.16 g/mol = 0.55 moles
Mass of solvent= density of solvent× volume of solvent
= 722 mL × 0.877 g/mL = 633.2 g or 0.6332 Kg
Molality of the solution = 0.55 moles/0.6332 Kg = 0.869 m
We know that;
ΔT = K m i
ΔT = Boiling point depression
K = Boiling point constant
m = molality of solution
i = Van't Hoff factor
ΔT = 2.53°C/m × 0.869 m × 1
ΔT = 2.2°C
Recall that;
ΔT = Boiling point of solution- Boiling point of pure solvent
Boiling point of solution = Boiling point of pure solvent + ΔT
Boiling point of solution = 80.1°C + 2.2°C
Boiling point of solution = 82.21°C
Learn more: https://brainly.com/question/2510654
A boy reached his home by riding motorcycle within 5 minutes by travelling 8 km distance ,them what is his average velocity?
Answers
Answer:24 kilometers
Explanation:Density divided by time
Calculate the molar mass of a vapor that has a density of 7.125 g/L at 13 ∘C and 741 torr .
Answers
Answer:
Molar Mass = 171.6 g/mol
Explanation:
Here we can use the equation PV = nRT, where n could stand for m / M, considering M = Molar Mass. Now we can rearrange this equation to isolate M, as we have to determine the " molar mass " of this vapor,
PV = ( m / M )RT,
density = mass / volume = PM / RT -
M = dRT / P
First convert celcius to kelvins and torr to " standard atmosphere " before plugging in the known values,
13 C = 286 K,
741 torr = 0.975 atm -
__________________________________________
M = (7.125)(0.0821) (286) / 0.975
M = 171.6 g /mol
explain to me why a rotting banana is a chemical change??
Answers
What formula would I use if I was given [OH-] and wanted to find POH?*
1 point
pH = -log[H+]
[H+]= 10^-pH
pOH = -log [OH-]
O [OH-] = 10^-POH
Answers
Answer:
pOH = -log[OH-]
Explanation:
Hello,
To calculate the pH or pOH of a substance, we relate it the negative logarithm of either the H+ or OH- concentration.
pOH is used to find the alkalinity of a solution my measuring the concentration of the hydroxide ion [OH-]. Solutions having a pOH value that is greater than 7 are said to be acidic while solutions with value less than 7 are alkaline.
pH = -log[H+]
While
pOH = -log[OH-]
Note: the pOH value of a solution depends on the concentration of the hydroxide ion in the solution.
1. An electric iron has a
power rating of 750W
a. How many joules of
electric energy does it
change into heat energy
every second?
b. How many joules of
work can it do in 3
seconds
c. How long does it take
the iron to do 1500J of
work?
2. Use the kinetic particle
theory to explain why a
solid has a definite shape
and liquid has none.
Answers
Explanation:
a) E = P × t
E = 750 × 1 s = 750 J
b) E = P × t
E = 750 × 3s = 2250 J
c) E = P × t
1500 = 750 × t
t = 1500/750
t = 2 s
What is an oxidation state?
Answers
Answer:
Oxidation state shows the total number of electrons which have been removed from an element (a positive oxidation state) or added to an element (a negative oxidation state) to get to its present state
Is a forward or reverse reaction favored?
Review the reversible reactions given, along with the associated equilibrium constant Kat room temperature. In each case, determine whether the forward or reverse reaction is favored. CH3COOH – CH3C00++ H+ Choose... Ka=1.8 x 10-5 Choose... AgCl → Agt + Cl Ksp=1.6 x 10-10 Al(OH)3 + A13+ + 30H Choose... Ksp=3.7 x 10-15 A+BAC Choose... K=4.9 x 103
Answers
Answer:
(a) [tex]CH_3COOH \rightleftharpoons CH_3COO^-+ H^+[/tex]: reverse reaction is favored.
(b) [tex]AgCl \rightleftharpoons Ag^+ + Cl^-[/tex]: reverse reaction is favored.
(c) [tex]Al(OH)_3 \rightleftharpoons Al^{3+} + 3OH^-[/tex]: reverse reaction is favored.
(d) [tex]A+B\rightleftharpoons C[/tex]: forward reaction is favored.
Explanation:
Hello,
(a) [tex]CH_3COOH \rightleftharpoons CH_3COO^-+ H^+[/tex]:
In this case, since the Ka is lower than 1, we infer the reverse reaction is favored since the reactant (acetic acid) will tend to have a higher concentration.
(b) [tex]AgCl \rightleftharpoons Ag^+ + Cl^-[/tex]:
In this case, since the Ka is lower than 1, we infer the reverse reaction is favored since the reactant (silver chloride) will tend to have a higher concentration.
(c) [tex]Al(OH)_3 \rightleftharpoons Al^{3+} + 3OH^-[/tex]
In this case, since the Ka is lower than 1, we infer the reverse reaction is favored since the reactant (aluminium hydroxide) will tend to have a higher concentration.
(d) [tex]A+B\rightleftharpoons C[/tex]
In this case, since the Ka is greater than 1, we infer the forward reaction is favored since the product (C) will tend to have a higher concentration.
Regards.
Classify each amino acid according to whether its side chain is predominantly protonated or deprotonated at a pHpH of 7.40.7.40. The pKapKa values of the Asp, His, and Lys side chains are 3.65, 6.00, and 10.53,3.65, 6.00, and 10.53, respectively.
Answers
Answer: His and Lys are deprotonated but Asp will be protonated.
Explanation:
As the pH is given as 7.4 and pK of His is given as 6.00. There will occur a positive charge on His when it's pH < pK therefore, it is neutral at the given pH.
As the pK value of Lys is 10.53 that is greater than the pH of 7.40. Therefore, charge on Lys is positive.
As the pK value of Asp is 3.65 which is less than the pH value of 7.40. Hence, Asp has a negative charge.
Therefore, we can conclude that His and Lys are deprotonated but Asp will be protonated.
An iceberg has a volume of 0.1642 ML. What is the mass of the ice(in kg) composing the iceberg( at 0o C)? The density of ice at 0o C is 0.917g/cm^3
Answers
Answer:
1.5x10¯⁴Kg
Explanation:
Data obtained from the question include the following:
Volume = 0.1642mL = 0.1642cm³
Density = 0.917g/cm³
Mass =.?
The Density of a substance is simply defined as the mass per unit volume of the substance. Mathematically, it is represented as:
Density = Mass /volume
With the above formula, we can calculate the mass of the ice as follow:
0.917 = Mass / 0.1642
Cross multiply
Mass = 0.917 x 0.1642
Mass = 0.151g
Finally, we shall convert 0.1506g to kg. This is illustrated below:
1000g = 1k
Therefore, 0.151g = 0.151/1000 = 1.5x10¯⁴Kg
Calculate the mean free path of electrons in a metal, such as silver, at room temperature form heat capacity and heat conduction measurements. Take EF ¼ 5 eV, K ¼ 4:29 102 J/s m K, and Cel v ¼ 1% of the lattice heat capacity. (Hint: Remember that the heat capacity in (21.8) is given per unit volume!)
Answers
Answer:
= 4 * 10-8 = 400 Angstrom
Explanation:
EF = 5 eV, K = 4.29 x 102 J/(s m K), and Cvel = 1% of the lattice heat capacity
K= 1/3 (Cv)*v*l
v is fermi velocity which is equal to [tex]v = (2E_f/m)^{0.5}[/tex]
after putting mass of electron as [tex]9.1 * 10^{-31}kg[/tex] and [tex]E_f = 5 eV[/tex] we get [tex]v= 1.33 * 10^6 m/s[/tex]
[tex]C_v[/tex] is 1% of lattice heat capacity
Heat Capacity of Aluminium is [tex]0.897 J g^{-1}K^-1[/tex]
Density = [tex]2.6989 g \ cm^{-3}[/tex]
For lattice heat capacity you need to use the heat capacity for alimunium given and then multiply with density to get per unit volume term
Heat Capacity per unit volume = [tex]0.897 J g^{-1}K^-1[/tex] * [tex]2.6989 g \ cm^{-3}[/tex]
[tex]= 2.42 J K^{-1} cm^{-3} \\\\= 2.42* 10^6 J K^{-1} m^{-3}[/tex]
Cv = 1% of heat capacity per unit volume
[tex]=0.01 * 2.42* 10^8 J K^{-1} m^{-3} \\\\= 2.42* 10^4 J K^{-1} m^{-3}[/tex]
Putting values in this equation K= 1/3 (Cv)*v*l
[tex]l = 3K/(C_v * v )\\\\ = 3 * 4.29 * 10^2 / (2.42* 10^4 * 1.33 * 10^6 )[/tex]
[tex]= 4 * 10^{-8 }[/tex]
= 400 Angstrom
The temperature of your water was 22.4 degrees Celsius. The volume of hydrogen collected was 37.1 mL. The atmospheric pressure in the lab room was 29.18 inches Hg. The difference in the water level between the beaker and the burette is 18.4 cm. What was the mass of the magnesium ribbon used?
Answers
Answer:
The correct answer is 27.22 mg.
Explanation:
Based on the given information, the temperature of the water given is 22.4 degree C or 22.4 + 273 = 295.4 K
The volume of the gathered hydrogen is 37.1 ml or 0.0371 L
The pressure mentioned in the lab room is 29.18 in Hg or 29.18 × 2.54 = 74.1172 cm Hg.
18.4 cm is the difference given in the water level between the burette and the beaker, so the pressure is,
74.1172 cm - 18.4 cm = 55.7172 cm Hg or 557.172 mmHg
760 mmHg is equal to 1 atm, therefore, 557.172 mmHg will be equal to,
557.172 mm Hg / 760 mm Hg × 1 atm = 0.733 atm
The moles of hydrogen gas can be calculated by using the ideal gas equation, that is, PV = nRT
n = PV / RT
Putting the values we get,
n = 0.733 atm × 0.0371 L / 0.0821 atm L mol⁻¹ K⁻¹ × 295.4 K
n = 0.00112 mol
Let us consider the equation,
2 HCl + Mg ⇒ H₂ + MgCl₂
By seeing the reaction it is clear that for the generation of 1 mole of hydrogen gas, 1 mole of magnesium is needed.
The moles of magnesium is 0.00112 moles and the molecular mass of magnesium is 24.305 gram per mol
The mass of magnesium ribbon can be determined by using the formula, mass = mole × molecular mass
mass = 0.00112 mole × 24.305 g/mol
mass = 0.02722 grams or 27.22 mg.
