(A) Heat absorbed by the steel boiler: $q_1 = m_1 s_1 \Delta T = 900 \times 0.11 \times (100 - 10) = 900 \times 0.11 \times 90 = 8910 \, kcal$. Heat a

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(A) Heat absorbed by the steel boiler: $q_1 = m_1 s_1 \Delta T = 900 \times 0.11 \times (100 - 10) = 900 \times 0.11 \times 90 = 8910 \, kcal$. Heat absorbed by the water: $q_2 = m_2 s_2 \Delta T = 400 \times 1.0 \times (100 - 10) = 400 \times 1.0 \times 90 = 36000 \, kcal$. Total net heat required $(Q_{net})$ = $q_1 + q_2 = 8910 + 36000 = 44910 \, kcal$. Since only $70 \%$ of the supplied heat is utilized,let $Q_{total}$ be the total heat supplied: $0.70 \times Q_{total} = 44910 \, kcal$. $Q_{total} = \frac{44910}{0.70} = 64157.14 \, kcal \approx 64157 \, kcal$.

Class 11 Chemistry Thermodynamics Mix Examples-Thermodynamics and Thermochemistry

Difficult

$A$ steel steam boiler has a mass of $900 \, kg$ and contains $400 \, kg$ of water. If the boiler and water receive only $70 \%$ of the heat supplied,how much heat in $kcal$ is required to raise the temperature of the boiler and water from $10 \, ^oC$ to $100 \, ^oC$? (Specific heat of steel = $0.11 \, kcal/kg \cdot K$,Specific heat of water = $1.0 \, kcal/kg \cdot K$)

A
$64157$
B
$64.157$
C
$5675$
D
$3842$

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Mix Examples-Thermodynamics and Thermochemistry

Which among the following are true for an irreversible isothermal expansion of an ideal gas?
$(i)$ $W = -Q$
$(ii)$ $\Delta U = 0$
$(iii)$ $\Delta H \neq 0$
$(iv)$ $\Delta T = 0$

EasyAP EAMCET 2021

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Following data is known about the melting of a compound $AB$: $\Delta H = 9.2 \ kJ \ mol^{-1}$,$\Delta S = 0.008 \ kJ \ K^{-1} \ mol^{-1}$. Its melting point is:

MediumAIIMS 2000

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$6 \ g$ of graphite is burnt in a bomb calorimeter at $25^{\circ} C$ and $1 \ atm$ pressure. The temperature of water increased from $25^{\circ} C$ to $31^{\circ} C$. If $\Delta H$ of this reaction is $-248 \ kJ \ mol^{-1}$,find out $C_V$ (in $kJ \ K^{-1}$) of the bomb calorimeter.

MediumAP EAMCET 2019

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Consider the following statements:
$(A)$ Entropy of a perfect crystalline solid at absolute zero approaches zero.
$(B)$ For spontaneity of a reaction at constant temperature and pressure, $T\Delta S > \Delta H$ (where $\Delta H$ is positive).
Identify the correct answer from the options given below.

MediumKCET 2026

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When $128 \, g$ of oxygen gas is heated from $0 \, ^oC$ to $100 \, ^oC$,the average values of $C_v$ and $C_p$ are $5 \, cal \, mol^{-1} \, K^{-1}$ and $7 \, cal \, mol^{-1} \, K^{-1}$ respectively. Find the values of $\Delta U$ and $\Delta H$.

Medium

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Which among the following are true for an irreversible isothermal expansion of an ideal gas?$(i)$ $W = -Q$$(ii)$ $\Delta U = 0$$(iii)$ $\Delta H \neq 0$$(iv)$ $\Delta T = 0$

Following data is known about the melting of a compound $AB$: $\Delta H = 9.2 \ kJ \ mol^{-1}$,$\Delta S = 0.008 \ kJ \ K^{-1} \ mol^{-1}$. Its melting point is:

$6 \ g$ of graphite is burnt in a bomb calorimeter at $25^{\circ} C$ and $1 \ atm$ pressure. The temperature of water increased from $25^{\circ} C$ to $31^{\circ} C$. If $\Delta H$ of this reaction is $-248 \ kJ \ mol^{-1}$,find out $C_V$ (in $kJ \ K^{-1}$) of the bomb calorimeter.

Consider the following statements:$(A)$ Entropy of a perfect crystalline solid at absolute zero approaches zero.$(B)$ For spontaneity of a reaction at constant temperature and pressure, $T\Delta S > \Delta H$ (where $\Delta H$ is positive).Identify the correct answer from the options given below.

When $128 \, g$ of oxygen gas is heated from $0 \, ^oC$ to $100 \, ^oC$,the average values of $C_v$ and $C_p$ are $5 \, cal \, mol^{-1} \, K^{-1}$ and $7 \, cal \, mol^{-1} \, K^{-1}$ respectively. Find the values of $\Delta U$ and $\Delta H$.

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Which among the following are true for an irreversible isothermal expansion of an ideal gas?
$(i)$ $W = -Q$
$(ii)$ $\Delta U = 0$
$(iii)$ $\Delta H \neq 0$
$(iv)$ $\Delta T = 0$