Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 115

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In the exothermic reaction the enthalpy of reaction is always:

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Important Questions on Thermodynamics

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 116

$C (s) + O_{2} (g) ⟶ {CO}_{2} (g)$ ; $ΔH = - 94.3$ $kcal / mol$

$CO (g) + \frac{1}{2} O_{2} (g) ⟶ {CO}_{2} (g)$ ; $ΔH = - 67.4$ $kcal / mol$

$O_{2} (g) ⟶ 2 O (g)$ ; $ΔH = 117.4$ $kcal / mol$

$CO (g) ⟶ C (g) + O (g)$ ; $ΔH = 230.6$ $kcal / mol$

Calculate $ΔH$ for $C (s) ⟶ C (g)$ in $kcal / mol$ .

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 117

The enthalpy change for the reaction of

5

liter of ethylene with

5

liter of

H_{2}

gas at

1.5

atm

pressure is

ΔH = - 0.5

kJ

. The value of

ΔU

will be: (

1

atm

Lt = 100

J

)

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 118

The species which by definition has ZERO standard molar enthalpy of formation at

298 K

is

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 119

Which of the reaction defines molar

{ΔH}_{f} °

?

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 120

In the reaction,

{CO}_{2} (g) + H_{2} (g) \to CO (g) + H_{2} O (g)

;

ΔH = 2.8

kJ

,

∆ H

represents:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 121

The standard enthalpy of formation of ammonia is $46.0$ $kJ {mol}^{- 1}$ . The standard enthalpy change for following reaction is:

$N_{2} + 3 H_{2} ⟶ 2 {NH}_{3}$

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 122

The heat of formation of $CO (g)$ and ${CO}_{2} (g)$ are $ΔH = - 110$ and $ΔH = - 393$ $kJ {mol}^{- 1}$ , respectively. What is the heat of reaction $(ΔH)$ for (in $kJ {mol}^{- 1}$ )the following reaction?

$CO (g) + \frac{1}{2} O_{2} (g) ⟶ {CO}_{2} (g)$

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 1>Q 123

The standard heat of combustion of solid boron is equal to: