CHEMISTRY CBA#4 MATH PROBLEMS

A 4.00L container of gas has a pressure of 1 atm when the temperature is 127°C. If the volume of the container is increased to 5.00L and the temperature is decreased to 54.0°C, what is the new pressure?

.654

If 500. mL of water is added to 300. mL of a 0.100 M solution of NaCl, what is the new concentration?

0.0375=M₂

What is the molarity of a 30.0 mL phosphoric acid solution (H₃PO₄) which is just neutralized by 48.0 mL of 0.100 M sodium hydroxide (NaOH)? 3 NaOH + H₃PO₄ → Na₃PO₄ + 3 HOH

0.053 M

If it takes 54 mL of 0.1 M NaOH to neutralize 25 mL of an H₂SO₄ solution, what is the concentration of the H₂SO₄? 2 NaOH + H₂SO₄ → Na₂SO₄ + 2 HOH

0.108 M

27.4 mL of 0.150 HCl reacts with 30.0 mL of KOH solution of unknown concentration. Calculate the concentration of the unknown solution. KOH + HCl → KCl + HOH

0.137 M

If 7.3 mL of 1.25 M HNO₃ is required to neutralize 25.00 mL of a Mg(OH)₂ solution, what is the molarity of the Mg(OH)₂? Mg(OH)₂ + 2 HNO₃ → Mg(NO₃)₂ + 2 HOH

0.183 M

If it takes 50 mL of 0.5 M Ca(OH)₂ solution to completely neutralize 125 mL of sulfuric acid solution (H₂SO₄), what is the concentration of the H₂SO₄ solution? Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2 HOH

0.2 M

If 36.3 mL of 0.152 M NaOH is required to neutralize 25.00 mL of an HC₂H₃O₂ solution, what is the molarity of the acetic acid? NaOH + HC₂H₃O₂ → NaC₂H₃O₂ + HOH

0.221 M

What will be the concentration of the HCl solution produced from the reaction of 0.750 L of 0.250 M Calcium chloride with 0.750 L of 1.25 M phosphoric acid? 3CaCl₂ + 2H₃PO₄ → Ca₃(PO₄)₂ + 6HCl

0.250 M

If 8.6 mL of 0.994 M HNO₃ is required to neutralize 25.00 mL of a LiOH solution, what is the molarity of the LiOH? HNO₃ + LiOH → LiNO₃ + HOH

0.342 M

A marshmallow peep is placed in a vacuum container (with a starting pressure of 1.0 atm). If the peep doubles in size, what is the new pressure?

0.50 atm

33.5 mL of 0.200 M Ca(OH)₂ reacts with 22.5 mL of HC₂H₃O₂ solution of unknown concentration. Calculate the concentration of the unknown solution. Ca(OH)₂ + 2 HC₂H₃O₂ → Ca(C₂H₃O₂)₂ + 2 HOH

0.596 M

If 525 mL of 0.80 M HCl solution is neutralized with 315 mL of Sr(OH)₂ solution what is the molarity of the Sr(OH)₂? 2 HCl + Sr(OH)₂ → SrCl₂ + 2 H₂O

0.67 M

If 12.0 mL of 1.34 M Ca(OH)₂ is required to neutralize 40.00 mL of HNO₃, what is the molarity of the HNO₃? Ca(OH)₂ + 2 HNO₃ → Ca(NO₃)₂ + 2 HOH

0.804 M

60.5 mL of HNO₃ are required to react with 25.0 mL of a 1.00 M Barium hydroxide solution: 2 HNO₃(aq) + Ba(OH)₂(aq) → 2 H₂O(s) + Ba(NO₃)₂(aq) Find the Molarity of the nitric acid solution.

0.826 M

Calculate the concentration of the magnesium nitrate solution produced when 25.0 ml of 10.0M magnesium chloride reacts with 125.0 ml of 2.20 M silver nitrate. 2AgNO₃ + MgCl₂ → Mg(NO₃)₂(s) + 2AgCl(aq)

0.917 M

What is the pH of a 0.09 M solution of HBr?

1.05

What is the pH of a 1.5 M acetic acid solution? (assume 5% dissociation)

1.12

If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31.0 liters, and a temperature of 87.0 °c, how many moles of gas do I have?

1.26 moles

Susan has a 1.5 L balloon at room temperature (305 K). If Susan brought the balloon outside (265K), what is the new volume of the balloon?

1.3 L

A normal tire on a car holds 10.0 Liters of air and has a pressure of 2.18 atm. If I pumped in 15.0 Liters of air into the tire, what would the new pressure be?

1.45 atm

What is the pOH of a solution that has a pH of 3.3?

10.7

What is the pH of a 0.10 M solution of Ammonium hydroxide? (assume 10% dissociation)

11

What is the pH of a 0.0015 M solution of NaOH?

11.18

How many milliters of 0.45 M HCl must be added to 25.0 mL of 1.00 M Ba(OH)₂ to make a neutral solution? 2 HCl + Ba(OH)₂ → BaCl₂ + 2 HOH

111.1 mL

A sample of carbon dioxide occupies a volume of 3.50 L at 125 kPa. What pressure would the gas exert if the volume were decreased to 1.00 L?

114 kPa

Calculate the mass of 15.0 L of NH3 at 27° C and 900. mm Hg.

12.3 g

If you have 300 grams of water how much NaCl can be dissolved at 90°C?

120 g

A balloon contains 30.0 L of helium gas at 103kPa. What is the volume of the helium when the balloon rises to an altitude where the pressure is only 25.0 kPa?

124 L

How many milliliters of 0.360 M HCl are required to neutralize 25.0 mL of 0.100 Ba(OH)₂? Ba(OH)₂ + 2 HCl → BaCl₂ + 2 HOH

13.89 mL

If I contain 3 moles of gas in a container with a volume of 60.0 liters and at a temperature of 400. K, what is the pressure (in kPa) inside the container?

166 kPa

What is the pH of 1098 L of a solution containing 8.543 moles of hydrobromic acid?

2.11

If I have 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 liters, what is the temperature?

205 K

The following reaction forms 6.41 L of oxygen at a temperature of 0.00°C and a pressure of 760. torr, what mass of KClO₃ must have decomposed? 2KClO₃ (s) → 2KCl (s) + 3O₂ (g)

23.4 g

If I have 7. 7 moles of gas at a pressure of 0.094 atm and at a temperature of 56 °C, what is the volume of the container that the gas is in?

2300 L

If I have 3.50 moles of gas held at a pressure of 5170 mmHg and a temperature of 600. K, what is the volume of the gas?

25.3 L

Calculate the grams of silver chloride produced from 10.00 ml of 10.0M magnesium chloride with 100.0 ml of 2.20 M silver nitrate. 2AgNO₃ + MgCl₂-->Mg(NO₃)₂(s) + 2AgCl(aq)

28.7g AgCl

A hiker carries a bag of potato chips up a mountain. He notices that his potato chip bag expands when he is at the top a mountain (Pressure= .6 atm). At the bottom of the mountain, the volume of the chip bag was 1.5 L and the pressure was 1.2 atm. What is the volume of the chip bag at the top of the mountain?

3 L

What is the [OH⁻] of an acid with a pH of 4.5?

3.16 x 10⁻¹⁰ M

How many molecules are there in 985 mL of nitrogen at 0.0° C and 1.00 x 10⁻⁶ mm Hg?

3.48x10¹³ molecules

What is the pH of 120 mL of a solution containing 0.005 grams of hydrochloric acid?

3.64

​30 grams will bring it to saturation If you have 50 g of NaNO₃ in 100 g of water at 10 °C you have an unsaturated solution. How many more grams will you need to add for the solution to be saturated

30 grams will bring it to saturation

When 62.7 g nitrogen and excess oxygen react they generate nitrogen dioxide. If the NO₂ is collected at 625 K and 73.3 kPa, what volume will it occupy? N₂ (g) + 2O₂ (g) → 2NO₂ (g)

317 L

A cannon is fired at an enemy. After the cannonball is shot from the cannon, the pressure is 760 mmHg atm and the temperature is 400.K. If the initial temperature in the cannon was 2000.K, what was the pressure in the cannon?

3800 mmHg

If 46.2 mL of 2.50 M NaOH is required to neutralize 25.00 mL of HNO₃, what is the molarity of the HNO₃? NaOH + HNO₃ → NaNO₃ + HOH

4.62 M

A helium-filled balloon has a volume of 208 L and it contains 9.95 moles of gas. If the pressure of the balloon is 1.26 atm, determine the temperature in Celsius degrees.

47.8⁰C

If I have 17 moles of gas at a temperature of 67 °C, and a volume of 88.89 liters, what is the pressure of the gas (in atmospheres)?

5.34 atm

An empty flask has a mass of 47.392 g and 47.816 g when filled with acetone vapor at 100.° C and 745 mm Hg. If the volume of the flask is 247.3 mL, what is the molar mass of the acetone?

53.6 g/mol

What volume of nitrogen gas, in liters, will be collected when 1.7 moles of NaN₃ decomposes? The reaction occurs at STP? 2NaN₃ (s) → 2Na (s) + 3N₂ (g)

57 L

How many grams of calcium phosphate can be produced from the reaction of 2.50 L of 0.250 M Calcium chloride with an excess of phosphoric acid? 3CaCl₂ + 2H₃PO₄ → Ca₃(PO₄)₂ + 6HCl

64.6g Ca₃(PO₄)₂

If a scuba tank that has a capacity of 10.0 L is filled with air to 500.0 KPa, what will be the volume of the air at 702.6 KPa?

7.12 L

What volume of O₂ is produced when 28.5 g of hydrogen peroxide (H₂O₂) decomposes to form water and oxygen at 150°C and 2.0 atm? 2H₂O₂ (aq) → 2H₂O (l) + O₂ (g)

7.3 L

What mass of CaSO₃ must have been present initially to produce 14.5 L of SO₂ gas at STP? CaSO₃ (s) → CaO (s) + SO₂ (g)

77.8 g

A scuba diver has a 2.0 L Oxygen tank with a pressure of 101.3 kPa and a temperature of 27.0°C at sea level. As the diver goes underwater, the temperature drops to 7.0°C. What is the new pressure?

93 kPa

Which substance is least soluble at 10 °C?

KClO₃

Which substance is most soluble at 10 °C?

KI

Which substance shows the greatest variation in temperature?

KNO₃

What is the concentration of the stock solution if 50.0 mL of the stock solution is diluted to make a 220. mL of a 0.400 M solution?

M₁= 1.76

Which substance shows the least change in temperature?

NaCl

Name three potential gases on the graph

SO₂, HCl, and NH₃

If you had 100 g of KNO₃ at 30 degrees dissolved in 300ml of water what type of solution will you have?

Unsaturated

*V= volume (L) What volume of 1.25 M solution contains 5.00 moles of solute?

V=5.00 mol/1.25 M V=4.00 L

Describe how to make 1.00L of a 1.00M solution of HCl from a concentrated solution of 11.8M?

V₁= 0.0847L 0.915L of water was added

Describe how to make 1.00L of a 1.00M solution of HCl from a concentrated solution of 11.8M?

V₁= 0.0847L add 84.7 mL of the concentrated acid to 0.915L (915 mL) of water

How much water must be added to 25.0 mL of a 1.00M stock solution of NaOH to make a 0.100M solution?

V₂= 0.250L 225 mL water was added

What is the molar concentration of a solution of copper(II) sulfate if 50.0g is dissolved in 600. mL of solution? What is the concentration of oxygen ions n this solution?

[CuSO4]= 0.522M mol=0.313 moles of Cu SO4 0.522M x 4= 2.09M [O]=2.09M

Calculate the concentration of a sodium chloride solution if 0.200 moles is dissolved in 250 mL of solution

[NaCl]= 0.800M

When 450. mL of a 0.150 M NaCl solution is mixed with 125 mL of a 0.220 M NaCl solution. What is the new NaCl concentration?

[new]=0.165M

How much SO₂ can be dissolved in 75 g of water at 10 °C?

about 12 -13 g

If you have 105 grams of KNO₃ at 60°C and the solution is cooled to 30°C, how many grams of KNO₃ will precipitate from the solution?

approximately 57 g

Use the solubility Curve: How many grams of KNO₃ will make a saturated solution at 50°C

approximately 83 grams

14 karat gold is an alloy composed of 58.5 % gold, 4.0 % silver, 31.2 % copper, and 6.3 % zinc. What is the solvent in 14 karat gold?

gold- present in greatest amount

What mass of sodium chloride is needed to make 0.250 L of a 0.100M solution?

mol=0.0250 Mass= 1.46g of NaCl

How many moles of solute are needed to make 400.mL of a 0.225M solution?

mol=0.0900 mol

If you have 80 grams of NaCl in 100 g of water at 90°C What type of solution do you have?

super saturated