If 35.0 g H2O at 22.7 S1U1P1$\circ$S1S1P0C is combined with 65.0 g H2O at 87.5 S1U1P1$\circ$S1S1P0C,what is the final temperature of the mixture? The specific heat capacity of water is 4.184 J/g.K.

A) 25.1 S1U1P1$\circ$S1S1P0C B) 45.4 S1U1P1$\circ$S1S1P0C C) 50.8 S1U1P1$\circ$S1S1P0C D) 64.8 S1U1P1$\circ$S1S1P0C E) 48.9 S1U1P1$\circ$S1S1P0C A) 25.1 S1U1P1$\circ$S1S1P0C B) 45.4 S1U1P1$\circ$S1S1P0C C) 50.8 S1U1P1$\circ$S1S1P0C D) 64.8 S1U1P1$\circ$S1S1P0C E) 48.9 S1U1P1$\circ$S1S1P0C

When 10.0 g KOH is dissolved in 100.0 g of water in a coffee-cup calorimeter,the temperature rises from 25.18 S1U1P1$\circ$S1S1P0C to 47.53 S1U1P1$\circ$S1S1P0C.What is the enthalpy change per gram of KOH dissolved in the water? Assume that the solution has a specific heat capacity of 4.18 J/g.K.

A) -116 J/g B) -934 J/g C) -1.03 $\times$ 103 J/g D) -2.19 $\times$ 103 J/g E) -1.03 $\times$ 104 J/g A) -116 J/g B) -934 J/g C) -1.03 $\times$ 103 J/g D) -2.19 $\times$ 103 J/g E) -1.03 $\times$ 104 J/g

The thermochemical equation for the combustion of methanol is shown below. CH3OH( )+ 3/2 O2(g)$\to$CO2(g)+ 2 H 2O(g) $\Delta$rHS1U1P1$\circ$S1S1P0= -638.7 kJ/mol-rxn What is the enthalpy change for the combustion of 8.59 g CH3OH?

A) -171 kJ B) -19.9 kJ C) -2.38 $\times$ 103 kJ D) -5.49 $\times$ 103 kJ E) -1.76 $\times$ 106 kJ A) -171 kJ B) -19.9 kJ C) -2.38 $\times$ 103 kJ D) -5.49 $\times$ 103 kJ E) -1.76 $\times$ 106 kJ

A bomb calorimeter has a heat capacity of 2.47 kJ/K.When a 0.123-g sample of ethylene (C2H4)was burned in this calorimeter,the temperature increased by 2.50 K.Calculate the enthalpy change per mole of ethylene combusted.

A) -5.29 kJ/mol B) -50.2 kJ/mol C) -563 kJ/mol D) -0.304 kJ/mol E) -1.41 $\times$ 103 kJ/mol A) -5.29 kJ/mol B) -50.2 kJ/mol C) -563 kJ/mol D) -0.304 kJ/mol E) -1.41 $\times$ 103 kJ/mol

Calculate $\Delta$rHS1U1P1$\circ$S1S1P0 for the combustion of ammonia, 4 NH3(g)+ 7 O2(g)$\to$ 4 NO2(g)+ 6 H2O( ) Using standard molar enthalpies of formation.

A) +30.24 kJ/mol-rxn B) -206.9 kJ/mol-rxn C) -298.6 kJ/mol-rxn D) -1398.8 kJ/mol-rxn E) -1663.6 kJ/mol-rxn A) +30.24 kJ/mol-rxn B) -206.9 kJ/mol-rxn C) -298.6 kJ/mol-rxn D) -1398.8 kJ/mol-rxn E) -1663.6 kJ/mol-rxn

The standard molar enthalpy of formation of NH3(g)is -45.9 kJ/mol.What is the enthalpy change if 9.51 g N2(g)and 1.96 g H2(g)react to produce NH3(g)?

A) -10.3 kJ/mol-rxn B) -20.7 kJ/mol-rxn C) -29.8 kJ/mol-rxn D) -43.7 kJ/mol-rxn E) -65.6 kJ/mol-rxn A) -10.3 kJ/mol-rxn B) -20.7 kJ/mol-rxn C) -29.8 kJ/mol-rxn D) -43.7 kJ/mol-rxn E) -65.6 kJ/mol-rxn

When 66.0 g of an unknown metal at 28.5 S1U1P1$\circ$S1S1P0C is placed in 83.0 g H2O at 78.5 S1U1P1$\circ$S1S1P0C,the water temperature decreases to 75.9 S1U1P1$\circ$S1S1P0C.What is the specific heat capacity of the metal? The specific heat capacity of water is 4.184 J/g.K.

A) 0.055 J/g.K B) 0.29 J/g.K C) 0.69 J/g.K D) 0.18 J/g.K E) 2.6 J/g.0K A) 0.055 J/g.K B) 0.29 J/g.K C) 0.69 J/g.K D) 0.18 J/g.K E) 2.6 J/g.0K

CaO(s)reacts with water to form Ca(OH)2(aq).If 6.50 g CaO is combined with 99.70 g H2O in a coffee cup calorimeter,the temperature of the resulting solution increases from 21.7 S1U1P1$\circ$S1S1P0C to 43.1 S1U1P1$\circ$S1S1P0C.Calculate the enthalpy change for the reaction per mole of CaO.Assume that the specific heat capacity of the solution is 4.18 J/g.K.

A) -1.45 kJ/mol B) -82.0 kJ/mol C) -9.42 kJ/mol D) -165 kJ/mol E) -532 kJ/mol A) -1.45 kJ/mol B) -82.0 kJ/mol C) -9.42 kJ/mol D) -165 kJ/mol E) -532 kJ/mol

The specific heat capacity of copper is 0.384 J/g.S1U1P1$\circ$S1S1P0C.What is the molar specific heat capacity of this substance? The molar mass of copper is 63.54 g/mol.

A) 24.4 J/mol.S1U1P1$\circ$S1S1P0C B) 0.00604 J/mol.S1U1P1$\circ$S1S1P0C C) 165 J/mol.S1U1P1$\circ$S1S1P0C D) 0.384 J/mol.S1U1P1$\circ$S1S1P0C E) 2.60 J/mol.S1U1P1$\circ$S1S1P0C A) 24.4 J/mol.S1U1P1$\circ$S1S1P0C B) 0.00604 J/mol.S1U1P1$\circ$S1S1P0C C) 165 J/mol.S1U1P1$\circ$S1S1P0C D) 0.384 J/mol.S1U1P1$\circ$S1S1P0C E) 2.60 J/mol.S1U1P1$\circ$S1S1P0C

Exam 6: Principles of Chemical Reactivity: Energy and Chemical Reactions

If 35.0 g H₂O at 22.7 ^$\circ$C is combined with 65.0 g H₂O at 87.5 ^$\circ$C,what is the final temperature of the mixture? The specific heat capacity of water is 4.184 J/g.K.

(Multiple Choice)

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Question 21

When 10.0 g KOH is dissolved in 100.0 g of water in a coffee-cup calorimeter,the temperature rises from 25.18 ^$\circ$C to 47.53 ^$\circ$C.What is the enthalpy change per gram of KOH dissolved in the water? Assume that the solution has a specific heat capacity of 4.18 J/g.K.

(Multiple Choice)

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Question 22

In thermodynamics,a(n)________ is defined as the object,or collection of objects,being studied.The surroundings include everything else.

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Question 23

If 46.1 g Cu at 11.6 ^$\circ$C is placed in 85.0 g H₂O at 72.4 ^$\circ$C,what is the final temperature of the mixture? The specific heat capacities of copper and water are 0.385 J/g.K and 4.184 J/g.K,respectively.

(Multiple Choice)

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Question 24

Which of the following statements is/are CORRECT? 1)A system is defined as an object or collection of objects being studied. 2)Surroundings are defined as the entire universe,including the system. 3)In an endothermic reaction,heat is transferred from the system to the surroundings.

(Multiple Choice)

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Question 25

The thermochemical equation for the combustion of methanol is shown below. CH₃OH( $The thermochemical equation for the combustion of methanol is shown below. CH3OH( )+ 3/2 O2(g) \to CO2(g)+ 2 H 2O(g) \Delta rH \circ = -638.7 kJ/mol-rxn What is the enthalpy change for the combustion of 8.59 g CH3OH?$ )+ 3/2 O₂(g) $\to$ CO₂(g)+ 2 H₂O(g) $\Delta$ _rH^$\circ$= -638.7 kJ/mol-rxn What is the enthalpy change for the combustion of 8.59 g CH₃OH?

(Multiple Choice)

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Question 26

The energy stored in a fuel is called _____.

(Multiple Choice)

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Question 27

A bomb calorimeter has a heat capacity of 2.47 kJ/K.When a 0.123-g sample of ethylene (C₂H₄)was burned in this calorimeter,the temperature increased by 2.50 K.Calculate the enthalpy change per mole of ethylene combusted.

(Multiple Choice)

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Question 28

How much heat is liberated at constant pressure if 0.834 g of calcium carbonate reacts with 48.9 mL of 0.668 M hydrochloric acid? CaCO₃(s)+ 2HCl(aq) $\to$ CaCl₂(aq)+ H₂O(l)+ CO₂(g); $\Delta$ _rH° = -15.2 kJ/mol-rxn

(Multiple Choice)

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Question 29

It is relatively easy to change the temperature of a substance that

(Multiple Choice)

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Question 30

Calculate $\Delta$ _rH^$\circ$ for the combustion of ammonia, 4 NH₃(g)+ 7 O₂(g) $\to$ 4 NO₂(g)+ 6 H₂O( $Calculate \Delta rH \circ for the combustion of ammonia, 4 NH3(g)+ 7 O2(g) \to 4 NO2(g)+ 6 H2O( ) Using standard molar enthalpies of formation.$ ) Using standard molar enthalpies of formation. $Calculate \Delta rH \circ for the combustion of ammonia, 4 NH3(g)+ 7 O2(g) \to 4 NO2(g)+ 6 H2O( ) Using standard molar enthalpies of formation.$

(Multiple Choice)

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Question 31

The standard molar enthalpy of formation of NH₃(g)is -45.9 kJ/mol.What is the enthalpy change if 9.51 g N₂(g)and 1.96 g H₂(g)react to produce NH₃(g)?

(Multiple Choice)

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Question 32

When 66.0 g of an unknown metal at 28.5 ^$\circ$C is placed in 83.0 g H₂O at 78.5 ^$\circ$C,the water temperature decreases to 75.9 ^$\circ$C.What is the specific heat capacity of the metal? The specific heat capacity of water is 4.184 J/g.K.

(Multiple Choice)

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Question 33

CaO(s)reacts with water to form Ca(OH)₂(aq).If 6.50 g CaO is combined with 99.70 g H₂O in a coffee cup calorimeter,the temperature of the resulting solution increases from 21.7 ^$\circ$C to 43.1 ^$\circ$C.Calculate the enthalpy change for the reaction per mole of CaO.Assume that the specific heat capacity of the solution is 4.18 J/g.K.

(Multiple Choice)

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Question 34

Many homes are heated using natural gas.The combustion of natural gas converts

(Multiple Choice)

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Question 35

Exactly 212.2 J will raise the temperature of 10.0 g of a metal from 25.0 °C to 60.0 °C.What is the specific heat capacity of the metal?

(Multiple Choice)

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Question 36

Combustion of 7.21 g of liquid benzene (C₆H₆)causes a temperature rise of 50.3°C in a constant-pressure calorimeter that has a heat capacity of 5.99 kJ/°C.What is $\Delta$ H for the following reaction? C₆H₆(l)+ $Combustion of 7.21 g of liquid benzene (C6H6)causes a temperature rise of 50.3°C in a constant-pressure calorimeter that has a heat capacity of 5.99 kJ/°C.What is \Delta H for the following reaction? C6H6(l)+ O2(g) \to 6CO2(g)+ 3H2O(l)$ O₂(g) $\to$ 6CO₂(g)+ 3H₂O(l)

(Multiple Choice)

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Question 37

Determine the heat of evaporation of carbon disulfide, Given the enthalpies of reaction below.

(Multiple Choice)

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Question 38

The specific heat capacity of copper is 0.384 J/g.^$\circ$C.What is the molar specific heat capacity of this substance? The molar mass of copper is 63.54 g/mol.

(Multiple Choice)

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Question 39

What quantity,in moles,of oxygen is consumed when 369.3 kJ of energy is evolved from the combustion of a mixture of H₂(g)and O₂(g)? H₂(g)+ $What quantity,in moles,of oxygen is consumed when 369.3 kJ of energy is evolved from the combustion of a mixture of H2(g)and O2(g)? H2(g)+ O2(g) \to H2O(l); \Delta rH° = -285.8 kJ/mol-rxn$ O₂(g) $\to$ H₂O(l); $\Delta$ _rH° = -285.8 kJ/mol-rxn

(Multiple Choice)

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Question 40

Showing 21 - 40 of 74

Exam 6: Principles of Chemical Reactivity: Energy and Chemical Reactions

If 35.0 g H2O at 22.7 ∘\circ∘ C is combined with 65.0 g H2O at 87.5 ∘\circ∘ C,what is the final temperature of the mixture? The specific heat capacity of water is 4.184 J/g.K.

When 10.0 g KOH is dissolved in 100.0 g of water in a coffee-cup calorimeter,the temperature rises from 25.18 ∘\circ∘ C to 47.53 ∘\circ∘ C.What is the enthalpy change per gram of KOH dissolved in the water? Assume that the solution has a specific heat capacity of 4.18 J/g.K.

In thermodynamics,a(n)________ is defined as the object,or collection of objects,being studied.The surroundings include everything else.

If 46.1 g Cu at 11.6 ∘\circ∘ C is placed in 85.0 g H2O at 72.4 ∘\circ∘ C,what is the final temperature of the mixture? The specific heat capacities of copper and water are 0.385 J/g.K and 4.184 J/g.K,respectively.

Which of the following statements is/are CORRECT? 1)A system is defined as an object or collection of objects being studied. 2)Surroundings are defined as the entire universe,including the system. 3)In an endothermic reaction,heat is transferred from the system to the surroundings.

The thermochemical equation for the combustion of methanol is shown below. CH3OH( )+ 3/2 O2(g) →\to→ CO2(g)+ 2 H 2O(g) Δ\DeltaΔ rH ∘\circ∘ = -638.7 kJ/mol-rxn What is the enthalpy change for the combustion of 8.59 g CH3OH?

The energy stored in a fuel is called _____.

A bomb calorimeter has a heat capacity of 2.47 kJ/K.When a 0.123-g sample of ethylene (C2H4)was burned in this calorimeter,the temperature increased by 2.50 K.Calculate the enthalpy change per mole of ethylene combusted.

How much heat is liberated at constant pressure if 0.834 g of calcium carbonate reacts with 48.9 mL of 0.668 M hydrochloric acid? CaCO3(s)+ 2HCl(aq) →\to→ CaCl2(aq)+ H2O(l)+ CO2(g); Δ\DeltaΔ rH° = -15.2 kJ/mol-rxn

It is relatively easy to change the temperature of a substance that

Calculate Δ\DeltaΔ rH ∘\circ∘ for the combustion of ammonia, 4 NH3(g)+ 7 O2(g) →\to→ 4 NO2(g)+ 6 H2O( ) Using standard molar enthalpies of formation.

The standard molar enthalpy of formation of NH3(g)is -45.9 kJ/mol.What is the enthalpy change if 9.51 g N2(g)and 1.96 g H2(g)react to produce NH3(g)?

When 66.0 g of an unknown metal at 28.5 ∘\circ∘ C is placed in 83.0 g H2O at 78.5 ∘\circ∘ C,the water temperature decreases to 75.9 ∘\circ∘ C.What is the specific heat capacity of the metal? The specific heat capacity of water is 4.184 J/g.K.

Many homes are heated using natural gas.The combustion of natural gas converts

Exactly 212.2 J will raise the temperature of 10.0 g of a metal from 25.0 °C to 60.0 °C.What is the specific heat capacity of the metal?

Combustion of 7.21 g of liquid benzene (C6H6)causes a temperature rise of 50.3°C in a constant-pressure calorimeter that has a heat capacity of 5.99 kJ/°C.What is Δ\DeltaΔ H for the following reaction? C6H6(l)+ O2(g) →\to→ 6CO2(g)+ 3H2O(l)

Determine the heat of evaporation of carbon disulfide, Given the enthalpies of reaction below.

The specific heat capacity of copper is 0.384 J/g. ∘\circ∘ C.What is the molar specific heat capacity of this substance? The molar mass of copper is 63.54 g/mol.

What quantity,in moles,of oxygen is consumed when 369.3 kJ of energy is evolved from the combustion of a mixture of H2(g)and O2(g)? H2(g)+ O2(g) →\to→ H2O(l); Δ\DeltaΔ rH° = -285.8 kJ/mol-rxn

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If 35.0 g H₂O at 22.7 ^$\circ$C is combined with 65.0 g H₂O at 87.5 ^$\circ$C,what is the final temperature of the mixture? The specific heat capacity of water is 4.184 J/g.K.

When 10.0 g KOH is dissolved in 100.0 g of water in a coffee-cup calorimeter,the temperature rises from 25.18 ^$\circ$C to 47.53 ^$\circ$C.What is the enthalpy change per gram of KOH dissolved in the water? Assume that the solution has a specific heat capacity of 4.18 J/g.K.

If 46.1 g Cu at 11.6 ^$\circ$C is placed in 85.0 g H₂O at 72.4 ^$\circ$C,what is the final temperature of the mixture? The specific heat capacities of copper and water are 0.385 J/g.K and 4.184 J/g.K,respectively.

A bomb calorimeter has a heat capacity of 2.47 kJ/K.When a 0.123-g sample of ethylene (C₂H₄)was burned in this calorimeter,the temperature increased by 2.50 K.Calculate the enthalpy change per mole of ethylene combusted.

How much heat is liberated at constant pressure if 0.834 g of calcium carbonate reacts with 48.9 mL of 0.668 M hydrochloric acid? CaCO₃(s)+ 2HCl(aq) $\to$ CaCl₂(aq)+ H₂O(l)+ CO₂(g); $\Delta$ _rH° = -15.2 kJ/mol-rxn

The standard molar enthalpy of formation of NH₃(g)is -45.9 kJ/mol.What is the enthalpy change if 9.51 g N₂(g)and 1.96 g H₂(g)react to produce NH₃(g)?

When 66.0 g of an unknown metal at 28.5 ^$\circ$C is placed in 83.0 g H₂O at 78.5 ^$\circ$C,the water temperature decreases to 75.9 ^$\circ$C.What is the specific heat capacity of the metal? The specific heat capacity of water is 4.184 J/g.K.

The specific heat capacity of copper is 0.384 J/g.^$\circ$C.What is the molar specific heat capacity of this substance? The molar mass of copper is 63.54 g/mol.