Calcium hydride (CaH2)reacts with water to form hydrogen gas: CaH2(s)+ 2H2O(l)→ Ca(OH)2(aq)+ 2H2(g) How many grams of CaH2 are needed to generate 48.0 L of H2 gas at a pressure of 0.888 atm and a temperature of 32°C?

A) 50.7 g B) 0.851 g C) 143 g D) 35.8 g E) 71.7 g A) 50.7 g B) 0.851 g C) 143 g D) 35.8 g E) 71.7 g

A mixture of 0.220 moles CO,0.350 moles H2 and 0.640 moles He has a total pressure of 2.95 atm.What is the pressure of CO?

A) 1.86 atm B) 0.649 atm C) 0.536 atm D) 1.54 atm E) 0.955 atm A) 1.86 atm B) 0.649 atm C) 0.536 atm D) 1.54 atm E) 0.955 atm

Determine the total pressure of all gases (at STP)formed when 50.0 mL of TNT (C3H5(NO3)3, D = 1.60 g/mL,molar mass = 227.10 g/mol)reacts according to the following reaction. 4 C3H5(NO3)3(l)→ 6 N2(g)+ O2(g)+ 12 CO2(g)+ 10 H2O(g)

A) 4.93 L B) 57.2 L C) 29.6 L D) 448 L E) 175 L A) 4.93 L B) 57.2 L C) 29.6 L D) 448 L E) 175 L

How many molecules of CO2 are contained in a 10.0 L tank at 7.53 atm and 485 K?

A) 1.89 × 1024 molecules B) 1.14 × 1024 molecules C) 8.32 × 1024 molecules D) 4.89 × 1024 molecules E) 3.63 × 1024 molecules A) 1.89 × 1024 molecules B) 1.14 × 1024 molecules C) 8.32 × 1024 molecules D) 4.89 × 1024 molecules E) 3.63 × 1024 molecules

Exam 5: Gases | Examlex

Calcium hydride (CaH₂)reacts with water to form hydrogen gas: CaH₂(s)+ 2H₂O(l)→ Ca(OH)₂(aq)+ 2H₂(g) How many grams of CaH₂ are needed to generate 48.0 L of H₂ gas at a pressure of 0.888 atm and a temperature of 32°C?

(Multiple Choice)

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Question 61

What is the Celsius temperature of 100.0 g of chlorine gas in a 55.0-L container at 800 mm Hg?

(Multiple Choice)

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Question 62

Using the graph below,determine the gas that has the lowest density at STP.

(Multiple Choice)

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Question 63

A 2.75-L container filled with CO₂ gas at 25°C and 225 kPa pressure springs a leak.When the container is re-sealed,the pressure is 185 kPa and the temperature is 10°C.How many moles of gas were lost?

(Multiple Choice)

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Question 64

Under identical conditions of temperature and pressure,which of the following gasses is the lightest?

(Multiple Choice)

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Question 65

The rate of effusion of oxygen to an unknown gas is 0.935.What is the other gas?

(Multiple Choice)

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Question 66

A basketball is inflated to a pressure of 1.90 atm in a 24.0°C garage.What is the pressure of the basketball outside where the temperature is -1.00°C?

(Multiple Choice)

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Question 67

Convert 1.50 atm to torr.

(Multiple Choice)

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Question 68

Determine the volume of H₂S (at 375 K and 1.20 atm)needed to produce 55.0 g of S.Assume that there is excess SO₂ present. 2 H₂S(g)+ SO₂(g)→ 3 S(s)+ 2 H₂O(g)

(Multiple Choice)

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Question 69

Which of the following gases has the lowest average speed at 25°C?

(Multiple Choice)

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Question 70

A mixture of 0.220 moles CO,0.350 moles H₂ and 0.640 moles He has a total pressure of 2.95 atm.What is the pressure of CO?

(Multiple Choice)

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Question 71

How many grams of XeF₆ are required to react with 0.579 L of hydrogen gas at 6.46 atm and 45°C in the reaction shown below? XeF₆(s)+ 3 H₂(g)→ Xe(g)+ 6 HF(g)

(Multiple Choice)

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Question 72

Consider a container of gas under a particular P,V,T set of conditions.Describe how the pressure would change if the volume were doubled while the absolute temperature was doubled.

(Essay)

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Question 73

What volume will 0.780 moles of He occupy at STP?

(Multiple Choice)

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Question 74

Determine the total pressure of all gases (at STP)formed when 50.0 mL of TNT (C₃H₅(NO₃)₃, D = 1.60 g/mL,molar mass = 227.10 g/mol)reacts according to the following reaction. 4 C₃H₅(NO₃)₃(l)→ 6 N₂(g)+ O₂(g)+ 12 CO₂(g)+ 10 H₂O(g)

(Multiple Choice)

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Question 75

Which of the following statements is true?

(Multiple Choice)

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Question 76

A mixture of N₂,O₂ and Ar has mole fractions of 0.25,0.65,and 0.10,respectively.What is the pressure of N₂ if the total pressure of the mixture is 3.9 atm?

(Multiple Choice)

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Question 77

How many molecules of CO₂ are contained in a 10.0 L tank at 7.53 atm and 485 K?

(Multiple Choice)

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Question 78

In the laboratory,hydrogen gas is usually made by the following reaction: Zn(s)+ 2 HCl(aq)→ H₂(g)+ ZnCl₂(aq) How many liters of H₂ gas,collected over water at an atmospheric pressure of 752 mm Hg and a temperature of 21.0°C,can be made from 3.566 g of Zn and excess HCl? The partial pressure of water vapor is 18.65 mm Hg at 21.0°C.

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Question 79

Determine the volume of O₂ (at STP)formed when 50.0 g of KClO₃ decomposes according to the following reaction.The molar mass for KClO₃is 122.55 g/mol. 2 KClO₃(s)→ 2 KCl(s)+ 3 O₂(g)

(Multiple Choice)

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Question 80

Showing 61 - 80 of 157

Calcium hydride (CaH₂)reacts with water to form hydrogen gas: CaH₂(s)+ 2H₂O(l)→ Ca(OH)₂(aq)+ 2H₂(g) How many grams of CaH₂ are needed to generate 48.0 L of H₂ gas at a pressure of 0.888 atm and a temperature of 32°C?

What is the Celsius temperature of 100.0 g of chlorine gas in a 55.0-L container at 800 mm Hg?

Using the graph below,determine the gas that has the lowest density at STP.

A 2.75-L container filled with CO₂ gas at 25°C and 225 kPa pressure springs a leak.When the container is re-sealed,the pressure is 185 kPa and the temperature is 10°C.How many moles of gas were lost?

Under identical conditions of temperature and pressure,which of the following gasses is the lightest?

The rate of effusion of oxygen to an unknown gas is 0.935.What is the other gas?

A basketball is inflated to a pressure of 1.90 atm in a 24.0°C garage.What is the pressure of the basketball outside where the temperature is -1.00°C?

Convert 1.50 atm to torr.

Determine the volume of H₂S (at 375 K and 1.20 atm)needed to produce 55.0 g of S.Assume that there is excess SO₂ present. 2 H₂S(g)+ SO₂(g)→ 3 S(s)+ 2 H₂O(g)

Which of the following gases has the lowest average speed at 25°C?

A mixture of 0.220 moles CO,0.350 moles H₂ and 0.640 moles He has a total pressure of 2.95 atm.What is the pressure of CO?

How many grams of XeF₆ are required to react with 0.579 L of hydrogen gas at 6.46 atm and 45°C in the reaction shown below? XeF₆(s)+ 3 H₂(g)→ Xe(g)+ 6 HF(g)

Consider a container of gas under a particular P,V,T set of conditions.Describe how the pressure would change if the volume were doubled while the absolute temperature was doubled.

What volume will 0.780 moles of He occupy at STP?

Determine the total pressure of all gases (at STP)formed when 50.0 mL of TNT (C₃H₅(NO₃)₃, D = 1.60 g/mL,molar mass = 227.10 g/mol)reacts according to the following reaction. 4 C₃H₅(NO₃)₃(l)→ 6 N₂(g)+ O₂(g)+ 12 CO₂(g)+ 10 H₂O(g)

Which of the following statements is true?

A mixture of N₂,O₂ and Ar has mole fractions of 0.25,0.65,and 0.10,respectively.What is the pressure of N₂ if the total pressure of the mixture is 3.9 atm?

How many molecules of CO₂ are contained in a 10.0 L tank at 7.53 atm and 485 K?

Determine the volume of O₂ (at STP)formed when 50.0 g of KClO₃ decomposes according to the following reaction.The molar mass for KClO₃is 122.55 g/mol. 2 KClO₃(s)→ 2 KCl(s)+ 3 O₂(g)

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Exam 5: Gases

Calcium hydride (CaH2)reacts with water to form hydrogen gas: CaH2(s)+ 2H2O(l)→ Ca(OH)2(aq)+ 2H2(g) How many grams of CaH2 are needed to generate 48.0 L of H2 gas at a pressure of 0.888 atm and a temperature of 32°C?

What is the Celsius temperature of 100.0 g of chlorine gas in a 55.0-L container at 800 mm Hg?

Using the graph below,determine the gas that has the lowest density at STP.

A 2.75-L container filled with CO2 gas at 25°C and 225 kPa pressure springs a leak.When the container is re-sealed,the pressure is 185 kPa and the temperature is 10°C.How many moles of gas were lost?

Under identical conditions of temperature and pressure,which of the following gasses is the lightest?

The rate of effusion of oxygen to an unknown gas is 0.935.What is the other gas?

A basketball is inflated to a pressure of 1.90 atm in a 24.0°C garage.What is the pressure of the basketball outside where the temperature is -1.00°C?

Convert 1.50 atm to torr.

Determine the volume of H2S (at 375 K and 1.20 atm)needed to produce 55.0 g of S.Assume that there is excess SO2 present. 2 H2S(g)+ SO2(g)→ 3 S(s)+ 2 H2O(g)

Which of the following gases has the lowest average speed at 25°C?

A mixture of 0.220 moles CO,0.350 moles H2 and 0.640 moles He has a total pressure of 2.95 atm.What is the pressure of CO?

How many grams of XeF6 are required to react with 0.579 L of hydrogen gas at 6.46 atm and 45°C in the reaction shown below? XeF6(s)+ 3 H2(g)→ Xe(g)+ 6 HF(g)

Consider a container of gas under a particular P,V,T set of conditions.Describe how the pressure would change if the volume were doubled while the absolute temperature was doubled.

What volume will 0.780 moles of He occupy at STP?

Determine the total pressure of all gases (at STP)formed when 50.0 mL of TNT (C3H5(NO3)3, D = 1.60 g/mL,molar mass = 227.10 g/mol)reacts according to the following reaction. 4 C3H5(NO3)3(l)→ 6 N2(g)+ O2(g)+ 12 CO2(g)+ 10 H2O(g)

Which of the following statements is true?

A mixture of N2,O2 and Ar has mole fractions of 0.25,0.65,and 0.10,respectively.What is the pressure of N2 if the total pressure of the mixture is 3.9 atm?

How many molecules of CO2 are contained in a 10.0 L tank at 7.53 atm and 485 K?

Determine the volume of O2 (at STP)formed when 50.0 g of KClO3 decomposes according to the following reaction.The molar mass for KClO3 is 122.55 g/mol. 2 KClO3(s)→ 2 KCl(s)+ 3 O2(g)

Matter, Measurement, and Problem Solving

Atoms and Elements

Molecules, Compounds and Chemical Equations

Chemical Quantities and Aqueous Reactions

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

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Calcium hydride (CaH₂)reacts with water to form hydrogen gas: CaH₂(s)+ 2H₂O(l)→ Ca(OH)₂(aq)+ 2H₂(g) How many grams of CaH₂ are needed to generate 48.0 L of H₂ gas at a pressure of 0.888 atm and a temperature of 32°C?

A 2.75-L container filled with CO₂ gas at 25°C and 225 kPa pressure springs a leak.When the container is re-sealed,the pressure is 185 kPa and the temperature is 10°C.How many moles of gas were lost?

Determine the volume of H₂S (at 375 K and 1.20 atm)needed to produce 55.0 g of S.Assume that there is excess SO₂ present. 2 H₂S(g)+ SO₂(g)→ 3 S(s)+ 2 H₂O(g)

A mixture of 0.220 moles CO,0.350 moles H₂ and 0.640 moles He has a total pressure of 2.95 atm.What is the pressure of CO?

How many grams of XeF₆ are required to react with 0.579 L of hydrogen gas at 6.46 atm and 45°C in the reaction shown below? XeF₆(s)+ 3 H₂(g)→ Xe(g)+ 6 HF(g)

Determine the total pressure of all gases (at STP)formed when 50.0 mL of TNT (C₃H₅(NO₃)₃, D = 1.60 g/mL,molar mass = 227.10 g/mol)reacts according to the following reaction. 4 C₃H₅(NO₃)₃(l)→ 6 N₂(g)+ O₂(g)+ 12 CO₂(g)+ 10 H₂O(g)

A mixture of N₂,O₂ and Ar has mole fractions of 0.25,0.65,and 0.10,respectively.What is the pressure of N₂ if the total pressure of the mixture is 3.9 atm?

How many molecules of CO₂ are contained in a 10.0 L tank at 7.53 atm and 485 K?

Determine the volume of O₂ (at STP)formed when 50.0 g of KClO₃ decomposes according to the following reaction.The molar mass for KClO₃is 122.55 g/mol. 2 KClO₃(s)→ 2 KCl(s)+ 3 O₂(g)