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A person requires $2870 kcal$ of energy, to lead a normal daily life. If the heat of combustion of cane sugar is $- 1349 kcal$ , then his daily consumption of sugar is :

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Important Questions on Chemical Thermodynamics and Energetics

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Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

Enthalpy of fusion and enthalpy of vaporization for water respectively are

6.01 kJ {mol}^{- 1}

and

45.07 kJ {mol}^{- 1}

0 ° C

what is enthalpy of sublimation at

0 ° C

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

If enthalpy of atomization for

B r_{2} (l)

x k J / m o l

and bond enthalpy for

B r_{2}

y k J / m o l

, the relation between them

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

Enthalpy of combustion of methane and ethane are

- 210 k cal / mol

and

- 368 k cal / mol

respectively. The enthalpy of combustion of decane is

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

The heat of combustion of carbon to

C O_{2}

- 393.5 kJ / mol

. The heat released upon the formation of

35.2 g

C O_{2}

from carbon and oxygen gas is

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

The enthalpy change on freezing of

1 mol

of water at

5 ° C

to ice at

- 5 ° C

is:

(Given

Δ_{fus} H = 6 kJ {mol}^{- 1}

0 ° C,

C_{p} (H_{2} O, l) = 75 .3 J {mol}^{- 1} K^{- 1}

C_{p} (H_{2} O, s) = 36 .8 J {mol}^{- 1} K^{- 1}

)

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

The elements with the highest and the lowest enthalpy of atomisation respectively, for first row transition elements are:

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

Lattice enthalpy and enthalpy of solution of

NaCl

are

788 {kJmol}^{- 1}

and

4 k J m o l^{- 1}

, respectively. The hydration enthalpy of

N a C l

is:

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

Given that bond energies of

H - H

and

Cl - Cl

are

430 kJ {mol}^{- 1}

and

240 kJ {mol}^{- 1}

respectively and

{ΔH}_{f}

for

HCl

- 90 kJ {mol}^{- 1}

. The bond energy of

HCl

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

The combustion of benzene

(l)

gives

{CO}_{2} (g)

and

H_{2} O (l) .

Given that heat of combustion of benzene at constant volume is

- 3263 .9 kJ {mol}^{- 1}

25 ° C;

the heat of combustion

(in kJ {mol}^{- 1})

of benzene at constant pressure will be

(R = 8 .314 {JK}^{- 1} {mol}^{- 1})

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

The heats of combustion of carbon and carbon monoxide are

- 393.5 a n d - 283.5 k J m o l^{- 1},

respectively. The heat of formation

(in kJ)

of carbon monoxide per mole is:

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

Nitroglycerine $(MW = 227.1)$ detonates according to the following equations,

$2 C_{3} H_{5} {({NO}_{3})}_{3} (l) ⟶ 3 N_{2} (g) + \frac{1}{2} O_{2} (g) + 6 {CO}_{2} (g) + 5 H_{2} O (g)$

The standard molar enthalpies of formation, ${ΔH}_{f} °$ for all the compounds are given below.

${ΔH}_{f} ° [C_{3} H_{5} {({NO}_{3})}_{3}] = - 364 kJ / mol$
${ΔH}_{f} ° [{CO}_{2} (g)] = - 393.5 kJ / mol$
${ΔH}_{f} ° [H_{2} O (g)] = - 241.8 kJ / mol$
${ΔH}_{f} ° [N_{2} (g)] = 0 kJ / mol$
${ΔH}_{f} ° [O_{2} (g)] = 0 kJ / mol$

The enthalpy change when $10 g$ of nitroglycerine is detonated is

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

Identify the INVALID equation.

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

For one mole of NaCl(s) the lattice enthalpy is

${Na}_{(s)} + \frac{1}{2} {Cl}_{2} (g) \overset{+ 108.4 kJ / mol}{⟶} {Na}_{(s)} + \frac{1}{2} {Cl}_{2} (g) \overset{+ 495.6 kJ / mol}{⟶} {Na}_{(g)}^{+} + \frac{1}{2} {Cl}_{2} (g) \overset{121 kJ / mol}{⟶}$

${Na}_{(g)}^{+} + Cl (g) \overset{- 348.6 kJ / mol}{⟶} {Na}_{(g)}^{+} + {Cl}_{(g)}^{-} \overset{{ΔH}^{0} altice}{⟶} Nacl$ (solid) $\underset{- 411.2 kJ / mol}{\leftarrow} {Na}_{(s)} + \frac{1}{2} {Cl}_{2} (g)$

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

The enthalpies of formation of

{CO}_{(g)}, {CO}_{2 (g)}

and

N_{2} O_{(g)}

are -110,-393 and

81 kJ {mol}^{- 1}

respectively. If the enthalpy of reaction

(Δ_{r} H)

for

N_{2} O_{4 (g)} + 3 {CO}_{(g)} \to N_{2} O_{(g)} + 3 {CO}_{2 (g)}

- 778 kJ,

the enthalpy of formation of

N_{2} O_{4} (g)

{kJmol}^{- 1}

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

The standard enthalpy of combustion of carbon is

393.5 kJ {mol}^{- 1}

. The amount of heat released when carbon and oxygen gas produce

35.2 g

{CO}_{2}

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

What will be the enthalpy of formation of toluene considering the data given?
Bond energies of

C - C = 79 kcal, C = C = 135 kcal,

C - H = 102 kcal,

heat of atomisation of

C = 156.8 kcal

and heat of atomisation of

H = 49.5 kcal

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

The enthalpy change of a chemical reaction in which

1

mole of a pure substance is formed from the free elements in their most stable states under standard state conditions is called

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

Enthalpy of sublimation of iodine is

24 c a l g^{- 1}

200 ° C

. If specific heat of

I_{2}

(s) and

I_{2}

(vap) are

0.055

and

0.031 c a l g^{- 1} K^{- 1}

respectively, then enthalpy of sublimation of iodine at

250 ° C

c a l g^{- 1}

is:

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

The standard enthalpies of formation of ${CO}_{2} (g)$ $, H_{2} O (l)$ and glucose (s) at $2 5^{o} C$ are $- 400 kJ / mol$ , $- 300 kJ / mol$ and $- 1300 kJ / mol$ , respectively. The standard enthalpy combustion per gram of glucose at $2 5^{o} C$ is

( ${ΔH}_{f}^{0} = - 1300 kJ {mol}^{- 1}$ for Glucose)

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics and Energetics>Enthalpy

The heat of atomization of methane and ethane are

360 kJ {mol}^{- 1}

and

620 kJ {mol}^{- 1}

, respectively. The longest wavelength of light capable of breaking the

C - C

bond is (Avogadro's number

= 6.023 \times 10^{23}, h = 6.62 \times 10^{- 34} J s

)

A person requires 2870 kcal of energy, to lead a normal daily life. If the heat of combustion of cane sugar is -1349 kcal, then his daily consumption of sugar is :

Important Questions on Chemical Thermodynamics and Energetics

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A person requires $2870 kcal$ of energy, to lead a normal daily life. If the heat of combustion of cane sugar is $- 1349 kcal$ , then his daily consumption of sugar is :