Answer:
There are 0.028 moles in 2.30 grams of NH₄SO₂.Explanation:
To Calculate:
How many moles are there in 2.30 grams of NH₄SO₂?We know that:
Mole = Given mass/Molar massWe have:
Given mass = 2.30 gMolar mass of NH₄SO₂ = 82Finding the number of mole:
⟶ Mole = 2.30/82
⟶ Mole = 0.028 (approx.)
Hence,
There are 0.028 moles in 2.30 grams of NH₄SO₂.How many moles are in 3.87 x 10 ^24 molecules of carbon?
Answer:
1 mole contains 6.02⋅1023 particles
Explanation:
Explanation:
X×6.02⋅1023=3.75⋅1024→
X=3.75⋅10246.02⋅1023=0.623⋅101=6.23 moles
Isoniazid is used in the treatment of tuberculosis and multiple sclerosis. Identify each lone pair as either localized or delocalized. Justify your answer in each case.
Answer:
Please find the complete question and its solution in the attached file:
Explanation:
8
What happens to solid waste in the circulatory system?
A it's expelled through the lungs
B
It pumps into the coronary circulation
C
It's dropped off in the kidneys
D
It's deposited in the aorta
Answer:c it’s dropped off in the kidneys
Explanation:
I took the quiz
The solid wastes are from the circulatory system is expelled to the kidney where, the nitrogenous wastes like urea and uric acid is excreted as urine from the body.
What is circulatory system ?A circulatory system is an organ system, where the blood is purified and oxygenation of blood takes place. Through circulatory system, the blood reaches throughout the body pumped from the heart through veins.
The organs included in circulatory system are lungs, heart, aorta, veins, blood vessels etc. There are various kinds of blood vessels each having specific functions.
There is a network of blood vessels including arteries and large veins, capillaries that join the venules and other veins. All the nutrients and ions are circulated throughout the body through blood and solid wastes are then expelled to kidney.
Kidney function as a sieve to clean the good fluid from waste products. Uric acid and urea along with water excreated as urine then. Thus, option C is correct.
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When two substances at room temperature are combined, the product feels HOT. What
kind of reaction is this?
Answer:
The correct answer is - exothermic reaction.
Explanation:
Exothermic reactions are the reaction that releases energy into the surrounding and does not require energy to take place due to the total energy of the reactants the total energy of the products is more than tthe total energy of the products. It releases energy usually as heat or light with the product.
In the given condition of room temperature mixing two substance produces hot products, fits with the explanation given above, therefore, it is an exothermic reaction.
Which describes the sequence of events of the development of the universe?
big bang → star and galaxy formation → expansion and cooling → atom formation → continuation of expansion and cooling
atom formation → star and galaxy formation → expansion and cooling → continuation of expansion and cooling → big bang
atom formation → big bang → star and galaxy formation → expansion and cooling → continuation of expansion and cooling
big bang → expansion and cooling → atom formation → star and galaxy formation → continuation of expansion and cooling
Answer:
big bang → expansion and cooling → atom formation → star and galaxy formation → continuation of expansion and cooling
Explanation:
Answer:
D: big bang → expansion and cooling → atom formation → star and galaxy formation → continuation of expansion and cooling
Explanation:
i just took the quiz and it was right! :)
CO2 + H20 - H2CO3
The reaction above is classified as
a combustion reaction
b double displacement
c synthesis
d decomposition
e single displacement
Answer:
the correct answer is option A
overfishing causes the yellow perch population in this food
web to decrease,
Otter
Osprey
Terrapin
Blue
crab
Algae
Snail
Yellow
perch
Shrimp
Cord grass
Which population is most likely to increase as a result?
A. Otter
The population likely to increase as a result is otter.
Option B is correct.
what is population?Population is described as the term typically used to refer to the number of people in a single area.
When the yellow perch population decreases, there is a decrease in predation pressure on the otter population which means that there are fewer yellow perch preying on the otters, which could lead to an increase in the otter population.
An organism population is described by characteristics that include: population size and the population density.
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How old are you?
0-12
12-17
17-25
69+
I don't know
Answer:
I don't know
Explanation:
that how old I am
Use the equations below to calculate the enthalpy of formation for propane gas, C3H8, from its elements, hydrogen gas and solid carbon. Please hurry!!
Answer: I got -4542.9kg/mol
Explanation:
Using the enthalpy relation, the enthalpy of formation of propane gas in the given equation is 4542.9 kJ/mol
[tex] △H_{f} = Product [/tex]Using the enthalpy value of [tex] CO_{2} [/tex] and[tex] H_{2}0[/tex] given :
Product = [tex] 3CO_{2} + 4H_{2}0[/tex] Product = 3(-393.5) + 4(-285.8) = - 2323.70Reactant = [tex] C_{3}H_{8} + 5H_{2}0[/tex] Water, H20 has △H = 0Reactant = [tex] C_{3}H_{8} + 0[/tex]
Enthalpy of formation = product - Reactant
2219.2 = -2323.70 - (propane + 0)
2219.2 = - 2323.70 - propane
Propane = - 2323.70 - 2219.2
[tex] C_{3}H_{8} = - 4542.9 [/tex]
Therefore, the entalphy of formation of propane gas is - 4542.9 kJ/mol.
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List or describe 2 chemical properties of gasoline
Answer:
The typical composition of gasoline hydrocarbons (% volume) is as follows: 4-8% alkanes; 2-5% alkenes; 25-40% isoalkanes; 3-7% cycloalkanes; l-4% cycloalkenes; and 20-50% total aromatics (0.5-2.5% benzene) (IARC 1989). ... Information regarding the chemical identity of gasoline is located in Table 3-l.
Explanation:
What is the concentration of a solution with a volume of 0.900 L that contains 2.05 mol of iron (II) hydroxide?
Answer:
The concentration is 2.277
Explanation:
The formula for finding the concentration of a solution is C= mole of solute divided by the volume of the solution
Therefore, C= 2.05/0.900
C=2.277
which ecosystem is the least stable
Answer:
cornfield
Explanation:
please help
A container containing 5.00 L of a gas is collected at 100 K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure (as required by Charles' Law)?
Answer:
[tex]T_2=400K[/tex]
Explanation:
Hello there!
In this case, according to the given information for this question, it turns out possible for us to calculate the final temperature, after the expansion process, by using the well-known Charles' gas law:
[tex]\frac{T_2}{V_2}=\frac{T_1}{V_1}[/tex]
Thus, we solve for the final temperature to obtain:
[tex]T_2=\frac{T_1V_2}{V_1}[/tex]
And plug in the given values:
[tex]T_2=\frac{100K*20.0L}{5.00L}\\\\T_2=400K[/tex]
Regards!
Match each definition with each vocabulary word shortage
Binding Price floor
Inefficient markets
Surplus
1. Calculation of equilibrium concentrations from Ka
Calculate the pH of a 1.0 M Acetic acid solution, using approximations. Ka = 1.8 x 10^-5
HC2H3O2+H2O⇆H3O(+)+C2H3O2(-)
Initial:
Change
at Equilibrium:
2. Calculation of species concentrations from Ka, using the quadratic formula
Calculate the pH of a 0.000010 M Acetic acid solution
HC2H3O2+H2O⇆H3O(+)+C2H3O2(-)
Initial:
Change:
at Equilibrium:
3. Calculation of Ka from the pH of a weak acid solution
Calculate the Ka of HNO2 if a 0.10 M HNO2 solution has a pH of 2.187
Initial:
Change:
at Equilibrium:
4. Calculation of Ka from the percent ionization
Calculate the Ka of Glycine if a 0.10 M Glycine solution is 4.1 x 10^-3 ionized
HGly+H2O⇆H3O(+)+Gly(-)
Initial:
Change:
at Equilibrium:
Titrating HCl with NaOH is an acid-base reaction. This is an example of _________ reaction: HCl (aq) + NaOH (aq) → H2O (l) + NaCl (aq)
Answer:
Neutralization reaction
The equivalence point of a titration corresponds to which of the following?
O the point where equal volumes of acid and base have been used
O Equivalence point is another term for end point
All of the listed options are true
Equivalence point is defined as the point where the pH indicator changes color
O the point where the acid and base have been added in proper stoichiometric amounts
Answer:
E: the point where the acid and base have been added in proper stoichiometric amounts
Explanation:
Equivalence point in titration is simply the point where the amounts of acid and base used just sufficiently reacts chemically to cause neutralization whereas the endpoint is the point where the indicator of the titration changes colour.
The Equivalence point occurs before the endpoint.
Thus, option E is correct.
What is the total number of moles of O2(g) that must react completely with 5.00 moles of C4H10(g)?
Answer:
32.5 moles of O2(g) are necessaries for a complete reaction
Explanation:
Based on the reaction of combustion of C4H10(g):
C4H10(g) + 13/2 O2(g) → 4CO2(g) + 5H2O(g)
1 mole of C4H10 needs 13/2 moles O2 for a complete reaction.
That means, the moles of O2 required for a reaction of 5.00 moles of C4H10 are:
5.00 moles C4H10 * (13/2mol O2 / 1mol C4H10) =
32.5 moles of O2(g) are necessaries for a complete reaction
There are four stages to the classical demographic transition model Pre-transitional Europe was characterized by high and
fluctuating mortality and a high birth rate. The transition model began to progress into and through stage 2 in the late 18th and early
19th century. All BUT ONE contributed to the decline in mortality.
S- -1]))
A)
Enacting measures to provide clean water supplies.
B)
Public health advances including quarantine of settlements undergoing
epidemics
The development of vaccines to prevent disease and antibiotics to treat
infection.
D)
Widespread acceptance of germ theory resulting in more hygienic
practices, including hand washing and sterilizing medical equipment and
infants' bottles.
Calculate how many grams of methane (CH4) are in a sealed 800. mL flask at room temperature (22 °C) and 780. mm of pressure. Show work pls.
"0.0340" mol of CH₄ are in sealed flask.
Methane (CH₄)Methane would also be a greenhouse gas, therefore its existence tends to affect humanity's surface temp as well as weather patterns framework; it is released into the atmosphere from such a wide assortment of life forms as well as biogenic.
According to the question,
Volume, V = 800 mL or, 0.800 L
Temperature, T = 22°C or, 295
Pressure, P = [tex]\frac{780}{760}[/tex] = 1.03 atm
As we know the relation,
The gram of moles will be will be:
→ n = [tex]\frac{PV}{RT}[/tex]
By substituting the values, we get
= [tex]\frac{1.03\times 0.800}{0.08206\times 295}[/tex]
= [tex]\frac{0.824}{242.077}[/tex]
= 0.0340
Thus the response above is correct.
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Naphthalene, C10H8, an ingredient in mothballs, has a molar mass of 128.18 g/mol. How many molecules of naphthalene are in a mothball that has 6.000 g of naphthalene?
Answer:
2.83 × 10²² molecules.
Explanation:
Using the formula below to calculate the number of moles of Naphthalene:
mole = mass/molar mass
Where;
mass = 6.00g
Molar mass = 128.18 g/mol
mole = 6/128.18
mole = 0.047mol
To calculate the number of molecules of naphthalene in the mothballs, we multiply the number of moles (n) by Avagadro's number i.e.
number of molecule = n × 6.02 × 10^23
number of molecules = 0.047 × 6.02 × 10^23
= 0.283 × 10²³
= 2.83 × 10²² molecules.
At 27.0°C, the volume of a gas is 630 L. At the same pressure, its volume is 92,0 mL at a temperature of
Answer:
–272.96 °C
Explanation:
From the question given above, the following data were obtained:
Initial temperature (T₁) = 27.0 °C
Initial volume (V₁) = 630 L.
Final volume (V₂) = 92.0 mL
Final temperature (T₂) =?
Next, we shall convert 27.0 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 27.0 °C
Initial temperature (T₁) = 27.0 °C + 273
Initial temperature (T₁) = 300 K
Next, we shall convert 92.0 mL to L. This can be obtained as follow:
1000 mL = 1 L
Therefore,
92 mL = 92 mL × 1 L / 1000 mL
92 mL = 0.092 L
Next, we shall determine the final temperature.
Initial temperature (T₁) = 300 K
Initial volume (V₁) = 630 L.
Final volume (V₂) = 0.092 L
Final temperature (T₂) =?
V₁ / T₁ = V₂ / T₂
630 / 300 = 0.092 / T₂
2.1 = 0.092 / T₂
Cross multiply
2.1 × T₂ = 0.092
Divide both side by 2.1
T₂ = 0.092 / 2.1
T₂ = 0.04 K
Finally, we shall convert 0.04 K to celsius temperature. This can be obtained as follow:
T(°C) = T(K) – 273
Final temperature (T₂) = 0.04 K
Final temperature (T₂) = 0.04 – 273
Final temperature (T₂) = –272.96 °C
What is the Earth’s atmosphere composed of, and why is it important?
Answer:
The atmosphere is a mixture of gases that surrounds the planet. We also call it air. The gases in the atmosphere include nitrogen, oxygen, and carbon dioxide. Along with water vapor, the atmosphere allows life to survive.
Answer:
air so we can breath
lol
Explanation:
NAD+ and FAD are called ____
Answer:
Nicotinamide adenine dinucleotide
Flavin adenine dinucleotide
Explanation:
hope this helps ^^
An example of a greenhouse gas is
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Clouds
E. Bad breathe
Answer:
oxygen
Explanation:
oxygen is very good for the health of every living thing
Answer:
C carbon dioxide
Explanation:
its bad
Antonio is a silversmith and works with various metals. At the end of the day, he reclaims and separates each metal by using an inexpensive toxic acid though other methods are available. The risk of fire as well as health dangers to Antonio is unknown. What should Antonio do
The question is incomplete, the complete question is;
Antonio is a silversmith and works with various metals. At the end of the day, he reclaims and separates each metal by using an inexpensive toxic acid though other methods are available. The risk of fire as well as health dangers to Antonio is unknown. What should Antonio do? A) Dispose of the used acid by pouring it down the drain since the government will take care of any environmental issues that come from polluting the water. B) Get a fire insurance policy and make sure to visit the doctor regularly. C) Switch to another potentially less dangerous method of separating each metal. D) Pour it out in back of the studio in the gutter.
Answer:
C) Switch to another potentially less dangerous method of separating each metal.
Explanation:
The importance of safety in manufacturing processes can not be over emphasized. Clearly, Antonio's method of separating each metal holds the potential of a fire outbreak or causing major health problem for Antonio.
The best thing that Antonio can do is to explore other less potentially dangerous methods of separating each metal since there are other available and possibly safer methods of achieving the same end.
In which phase of wound healing is fibrin most involved?
Answer:
Finally, coagulation occurs and reinforces the platelet plug with threads of fibrin which are like a molecular binding agent. The hemostasis stage of wound healing happens very quickly.
Explanation:
Hope it helps u
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Name the following ether:
CH3OCH3
A. dimethyl ether
B. diethyl ether
C. ethanol
D. methyl methyl ether
Answer: Name of the ether [tex]CH_{3}OCH_{3}[/tex] is dimethyl ether.
Explanation:
When alkyl groups are attached to an oxygen atom then the resulting compound is known as an ether.
While writing the name of ethers the alkoxy side which is the shorter side is named first and then the other side is named.
For example, [tex]CH_{3}OCH_{3}[/tex] contains two methyl groups so a prefix "di" will be added to it name.
Hence, its name is dimethyl ether.
Thus, we can conclude that name of the ether [tex]CH_{3}OCH_{3}[/tex] is dimethyl ether.
What is the hypothetical van't Hoff factor of magnesium nitrate, Mg(NO3)2?
Answer:
The hypothetical van't Hoff factor of magnesium nitrate,[tex]Mg(NO_3)_2[/tex] is 3 .
Explanation:
Lets calculate -
[tex]Mg(NO_3)_2\rightarrow Mg^2^+ +2NO_3^-[/tex]
We know that ,
[tex]i=\alpha n+(1-\alpha )[/tex]
Dissociation should be 100% for the hypothetical vant hoff factor , that is
[tex]\alpha =1[/tex] and [tex]n=3[/tex] for [tex]Mg(NO_3)_2[/tex]
Therefore , putting the given values ,
[tex]i=1\times3+(1-1 )[/tex]
[tex]i=3+0[/tex]
[tex]i=3[/tex]
Hence , the answer is 3.
The hypothetical van't Hoff factor of magnesium nitrate is 3.
Van't Hoff factor is a measure of the deviation of a solution from ideal behavior. It depends on the number of particles in the solution. The more the particles in solution, the greater the Van't Hoff factor and the greater the deviation from ideal behavior.
For Mg(NO3)2, the hypothetical van't Hoff factor is 3 since there are three particles in solution when magnesium nitrate is dissolved in water.
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What is the best reason for carbon dioxide existing as a gas at standard temperature and pressure?
A)
Carbon dioxide molecules have the same spin within each of their orbitals.
As a result, the carbon dioxide molecules are less attracted to each other
when compared to the intramolecular bonds.
B)
Coulomb's law shows that the interaction between protons and electrons
within the atoms of each carbon dioxide molecule is significantly stronger
than the proton-electron interaction between each molecule.
C)
The entropy of carbon dioxide is much greater than the entropy of its
surroundings.
D)
Carbon dioxide has too much internal energy that the molecule-molecule
interaction cannot keep the molecules together.
