mol of excess acid: 50 cm ³x 0.05 M = 2.5 mlmol
mol of acid reacted: (250 cm³ x 0.05 M) - 2.5 mlmol = 10 mlmol = 10 x 10⁻³ mol
MM (molar mass) MO = mass : mol = 0.28 : 10 x 10⁻³ = 28
MM MO = Ar M + Ar O
28 = Ar M + 16
Ar M = 12
I think the answer is A
would the water in a pond or the water in a full bathtub have more thermal energy? why?
BATHTUB BATHTUB BATHTUB
Explain, in terms of structure and bonding, why iron (a metal) has higher melting point than sodium chloride (an ionic compound).
Answer:
As metals are giant lattice structures, the number of electrostatic forces to be broken is extremely large
Explanation:
This means that the melting point and boiling point of metals are more similar to those for ionic compounds than for covalent substances.
When ur a weak acid is dissolved….
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
The Correct choice is A. H+ , F- and HF
Since HF is a weak acid, it behaves like an weak electrolyte in water. so, there is incomplete dissociation of HF in water. Therefore, there will be HF molecules present in the solution along with the ions ~
What amount of heat energy would be necessary to raise the temperature of 100 g of water at room temperature (25°C) to the boiling point (100°C)? The specific heat of water is 1.0 cal/g°C.
75 kcal
100 kcal
750 kcal
7.5 kcal
Answer:
7.5 kcal
Explanation:
1.0 cal /g-C * 100 g * (100- 25 C) = 7500 cal = 7.5 kcal
The amount of heat energy necessary to raise the temperature of 100 g of water at room temperature (25°C) to the boiling point (100°C) is 7.5 kcal.
Given to us the mass of water, the specific heat of water, and the change in temperature, we need to calculate the amount of heat energy.
m = 100 g
c = 1.0 cal/g°C
ΔT = (100 °C - 25 °C) = 75 °C
To calculate the amount of heat energy required, we can use the formula:
Q = m × c× ΔT
Where:
Q = heat energy (in calories)
m = mass of water (in grams)
c = specific heat of water (in cal/g°C)
ΔT = change in temperature (in °C)
Substituting the values into the formula:
Q = 100 g × 1.0 cal/g°C × 75 °C
Q = 7500 cal
7500 cal = 7.5 kcal
Therefore, the amount of heat energy required to raise the temperature of 100 g of water from 25 °C to 100 °C is 7500 calories, which is equivalent to 7.5 kcal.
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How Do density and atomic Mass change as atomic number increases
Answer: Atoms with a lower atomic mass have a greater density than the atom with the higher atomic weight because the atoms are tightly packed together. The volume of a material can change with temperature and pressure. This can also modify the density of the material.
Explanation: HOPE IT HELPS YOU . PLEASE GIVE BRAINLIEST . THANKS .
can someone please show work and help me with this thank you <3
Answer:
.846 grams of H2
Explanation:
How many moles of water (H2O) would be produced from the reaction of 3 moles of hydrochloric acid (HCl) reacting with excess calcium hydroxide (Ca(OH)2)?
Answer:
3 moles
Explanation:
The balanced chemical equation between Calcium Hydroxide and Hydrochloric acid is:
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
The ratio of HCl to H₂O is 2 : 2
So if 3 moles of hydrochloric acid is added, 3 moles of water will be formed:
[x is the no of moles of H₂O produced]
2 : 2
3 : x
[Cross multiply]
2x = 2 × 3
2x = 6
x = [tex]\frac{6}{2}[/tex] = 3 moles
How many moles of sodium ions are in 5.70 grams of sodium sulfide?
Answer:
0.07
Explanation:
to find mole you divide mass by the relative atomic mass
Now you find the relative atomic of of moles pf he number sodium sulfide
then you thequation for finding moles to find mole of sodium
the heat of vaporization of water is 40.7 kj/mol. at what temperature is the vapor pressure 145 torr
From the calculations and the data provided in the question, the required temperature is 380 K.
What is the Clasius - Clapeyron equation?The Clasius Clapeyron equation is used to obtain the vapor pressure of a substance at two different temperatures.
Hence;
lnP2/P1 = -ΔHvap/R(1/T2 - 1/T1)
ln(145/1) = -40.7 * 10^3/8.314(1/T2 - 1/273)
4.977 = -(4811)(1/T2 - 1/273)
4.977/-(4811) = (1/T2 - 1/273)
-0.00103 = 1/T2 - 1/273
-0.00103 + 1/273 = 1/T2
0.002633 =1/T2
T2 = 380 K
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How Many grams of H2O are equivalent to 0.4 mole of H2O ?
Answer:
0.72 grams
Explanation:
A 43.8 mL sample of a 5.0 M KNO3 solution is diluted to 1.00 L. What volume of the diluted solution contains 17.0 g of KNO3? (Hint: Figure out the concentration of the diluted solution first.)
Part 1. A glass bottle, which is half-filled with water, has a balloon attached to its opening. The bottle is placed in a hot water bath for some time. Explain the change to the size of the balloon based on the kinetic molecular theory.
Part 2. What would most likely happen to the balloon if the bottle was then placed into a jar of cold water with ice cubes? Explain your answer based on the kinetic molecular theory.
In both cases, assume the balloon is attached tightly enough so that air does not escape the system. (10 points)
1) Heat is transferred from the bath to the bottle. This will cause the temperature of the gas molecules to increase, and thus their kinetic energy will increase. As a result, the size of the balloon will increase.
2) The size of the balloon would decrease because since the temperature is decreasing, the particles have less kinetic energy, and thus are packed more closely together.
Balance the equation
Ba(OH)2(aq) + HNO3(aq) + Ba(NO3)2(aq) + H2O(1)
Express your answer as a chemical equation, Identify all of the nhases in your
Balanced chemical equation for the given reaction is Ba(OH)₂(aq) + 2HNO₃(aq) → Ba(NO₃)₂(aq) + 2H₂O(l).
What is balanced equation?Balanced equations are those equation in which all entities are present in equal amount on the reactant side as well as on the product side of the chemical reaction.
Balanced chemical reaction will be represented as:
Ba(OH)₂(aq) + 2HNO₃(aq) → Ba(NO₃)₂(aq) + 2H₂O(l)
In the above reaction all entities are present in the equal amount on both side of the chemical reaction.
Hence balanced chemical equation is Ba(OH)₂(aq) + 2HNO₃(aq) → Ba(NO₃)₂(aq) + 2H₂O(l).
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What are the reactants in the reaction?
What are/is the product of the reaction?
Answer:
reactants are hydrogyn and oxygen, the product is water
Explanation:
Reactants are what start the reaction, they are joined together making a reaction that can result in a mix of both or a really new product. The product is, as named, the product of the reactants reaction, it is the outcome. In this case, hydrogen and oxygen join together, making a reaction that ended up with water(the product).
ur wlcm :)
brainliest?
Julio rubs a balloon with a clothes and places the balloon next to his head. He uses another balloon and places il next to his head without rubbing a cloth against it Select the control in Julio's experiment.
Answer: i don't know what you mean by control but if you mean what will happen is the balloon if he rubs it on his head and not his clothes electrons move from the atoms and molecules in his hair onto the balloon and since electrons have a negative charge the balloon will become negatively charged and his hair will become positively charged.
Answer: the ballon that was not rubbed with cloth
Explanation:
If you burned 52 grams of methane (CH4) and obtained 100 grams of water as a
product what is your percent yield?
The percent yield of methane is 85.5%.
What is percent yield of a reaction?The percent yield of a reaction is the ratio of the actual yield and the expected yield expressed as a percentage.
Percent yield = actual yield/expected yield × 100%Equation of reaction is given below:
1 mole of methane produces 2 moles of water
16 g of methane produces 36 grams of water
52 g of methane will produce 117 g of water
Percent yield = 100/117 × 100% = 85.5%
Therefore, the percent yield of methane is 85.5%.
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A 21.94-gram sample of magnesium nitrate was used to create a 2.11 M solution. What is the
volume of the solution in milliliters?
Answer:
70.1 mL
Explanation:
First let's look at the formula for magnesium nitrate, and get the molar mass, we should end up with Mg(NO3)2 for the formula and this should have a molar mass of 148.3 g/mol.
Lets get the number of moles of the magnesium by taking the number of grams over the molar mass, (21.94 g)/(148.3 g/mol). grams cancel and we're left with approximately 0.148 moles.
Now let's plug our numbers into the molarity formula, M = n/L, this should give us 2.11 mol/L = (0.148 mol)/L, now let's solve for L, divide both sides by 0.148 which will give us 14.26 L^-1 = 1/L now we take the inverse of both sides to get 0.07012 L = L.
Now we have the liters, but the question askes for milliliters, so let's multiply by 1000, and then after rounding to sig figs we will get 70.1 mL as our answer. (Note: I used the exact values instead of the approximations throughout this explanation, so if you calculate the answer by plugging in these values, it might be slightly off.)
the tutorial associated with this question.
What is the total number of atoms contained in 2 moles of
iron?
A
O 118
O 1.204 x 1024
O 2
O 6022 y 1023
__H₂SO4 +2NH₂OH → 2H₂O + _(NH4)₂SO4
How many moles of water will be produced if 3.5 moles of sulfuric acid reacts?
Taking into account the reaction stoichiometry, 7 moles of water will be produced if 3.5 moles of sulfuric acid reacts.
Reaction stoichiometryIn first place, the balanced reaction is:
H₂SO4 + 2 NH₂OH → 2 H₂O + (NH₄)₂SO₄
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
H₂SO₄: 1 moleNH₂OH: 2 moles (NH₄)₂SO₄: 1 moleH₂O: 2 molesMass of water formedThe following rule of three can be applied: If by stoichiometry of the reaction 1 mole of sulfuric acid produces 2 moles of water, 3.5 moles of sulfuric acid produces how many moles of water?
[tex]moles of water=\frac{3.5 moles of sulfuric acidx2 moles of water}{1 mole of sulfuric acid}[/tex]
moles of water= 7 moles
Then, 7 moles of water will be produced if 3.5 moles of sulfuric acid reacts.
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What are the answers
C6H12 + 9 O2 –> 6 CO2 + 6 H2O
How many grams of O2 are consumed when C6H12 is burned to yield 5.3 grams of CO2?
5.76 g of [tex]O_2[/tex] are consumed when [tex]C_6H_1_2[/tex] is burned to yield 5.3 grams of [tex]CO_2[/tex].
What is a mole?A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others.
Calculating moles of [tex]CO_2[/tex]
Number of mole of [tex]CO_2[/tex] = [tex]\frac{\;Given \;mass}{\;Molar \;mass}[/tex]
[tex]\frac{\;Given \;mass}{\;Molar \;mass}[/tex] = [tex]\frac{5.3g}{44 g/mol}[/tex] = 0.12 mol
As is clear from the reaction stoichiometry, 9 moles of [tex]O_2[/tex]6 moles of [tex]CO_2[/tex].
Calculating the number of moles of [tex]CO_2[/tex]
[tex]\frac{0.12 X 9}{6}[/tex] = 0.18 mol
Mass of [tex]O_2[/tex] =5.76 g
Hence, 5.76 g of [tex]O_2[/tex] are consumed when [tex]C_6H_1_2[/tex] yield 5.3 grams of [tex]CO_2[/tex].
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IF 0.5 MOL NITROGEN GAS HAS A VOLUME OF II.0 L SOME TEMPERATURE AND
PRESSURE, WHAT WOULD THE VOLUME BE OF 0.8 MOL OF NITROGEN GAS AT THE SAME
TEMPERATURE AND PRESSURE VALUES?
Vi= 0.5 mol
Answer:
17.92L or 17.92dm³1
Explanation:
number of moles of a gas = volume of that gas/ 22.4(S.V.P)
0.8 mol = x / 22.4
cross multiplication
x = 22.4 × 0.8
x = 17.92
:. the volume of 0.8 mol of nitrogen gas is 17.92dm³ or 17.92L
Please look at the picture attached. If you understand it, it would be nice because I have a Science quiz tomorrow!
Answer:
1. East on the box they are facing, West on the side from behind, North on the left side, South on the right side.
2. Because they all were facing towards the sun and the sun rise from east.
3. This one's answer is in the first answer.
4. The picture shows early morning because the shadow of the boys are in a flat position but if would have been late morning then it would not been covering that much area.
whats the formula for finding the number of moles in an element reacting with another element
Answer: Mass of substance / Mass of one mole.
Explanation:
How many calcium atoms will you need to balance this: Ca(PO4)
Answer: 2
Explanation: Calcium has a +2 charge and PO4 has a -1 charge. When writing this expression, the charges are flipped; instead of Ca2(PO4), it's Ca(PO4)2.
Which of the following is true for a chemical reaction at equilibrium?
Answer:
youre gonna have to include the answers for me to help
Explanation:
A solution is prepared by dissolving 4.85 g of HCl into enough water to make 2.50 L of solution. Calculate the pH of the solution.
The pH of the solution in which 4.85g of HCl is present is 1.3.
How do we calculate pH?pH of the solution will be calculated by using the below equation:
pH = -log[H⁺]
Relation between the mass and moles of any substance will be represented as:
n = W/M, whereW = given massM = molar massMoles of HCl = 4.85g / 36.4g/mol = 0.13 moles
Given volume = 2.5 L
Concentration in terms of molarity will be calculated as:
M = n/V
M = 0.13mol / 2.5L = 0.05 M
So, 0.05M HCl solution have the same amount of concentration of H⁺ ion. Now pH will be calculated as:
pH = -log(0.05) = 1.3
Hence required pH of the solution is 1.3.
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What pressure (in atm) is required to contain 0.034 moles of oxygen gas in a 5.1 L container at a temperature of 25.00C
Answer:
0.16 atm
Explanation:
Let's look at the formula PV=nRT. First of all, T should be in kelvin, so let's add 273. Now solve for P so we get P = nRT/V.
Now let's plug these in...
P = (0.034 mol)(0.08206 L atm mol^-1 K^-1)(298 K)/5.1 L
After solving and rounding to sig figs we get 0.16 atm
As the pressure of a gas increases, the ________ decreases, if the temperature is constant.
Answer:
The volume of the gas decreases.Explanation:
5.1 mol of a compound contains 1 mol of carbon and 1 mol of oxygen what is the molecular mass of the compound
