(C) The molar mass of water $(H_2O)$ is $18 \ g \ mol^{-1}$.Given $\Delta H_{vap} = 40.79 \ kJ \ mol^{-1}$.For $18 \ g$ of water,the heat required for

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(C) The molar mass of water $(H_2O)$ is $18 \ g \ mol^{-1}$.Given $\Delta H_{vap} = 40.79 \ kJ \ mol^{-1}$.For $18 \ g$ of water,the heat required for evaporation is $40.79 \ kJ$.For $30 \ g$ of water,the heat required is calculated as:$q = \frac{30 \ g}{18 \ g \ mol^{-1}} \times 40.79 \ kJ \ mol^{-1} = 1.666 \ mol \times 40.79 \ kJ \ mol^{-1} \approx 67.98 \ kJ \approx 68 \ kJ$.

Class 11 Chemistry Some Basic Concepts of Chemistry Mix Examples of Some Basic Concept of Chemistry

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$A$ person coming out of a swimming pool has $30 \ g$ of water on their body. How much heat in $kJ$ is required to evaporate this water? (The latent heat of vaporization of water is $40.79 \ kJ \ mol^{-1}$)

A
$46$
B
$40.76$
C
$68$
D
$82$

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Some Basic Concepts of Chemistry

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Mix Examples of Some Basic Concept of Chemistry

What volume of $NH_3$ gas at $STP$ would be needed to prepare $100 \ mL$ of $2.5$ molal $(2.5 \ m)$ ammonium hydroxide solution? (Assume the density of the solution is $1 \ g/mL$)

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In which of the following reactions is no gas evolved on the product side? (Temperature is maintained below the boiling point of liquids formed)

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$K_2CS_3$ is called potassium ...... .

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Write formulas for the following compounds:
$(1)$ Mercury $(II)$ chloride
$(2)$ Nickel $(II)$ sulphate
$(3)$ Tin $(IV)$ oxide
$(4)$ Thallium $(I)$ sulphate

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The number of moles of solute present in the solutions of $I$,$II$ and $III$ is respectively:
$I$. $500 \ mL$ of $0.2 \ M \ NaOH$
$II$. $200 \ mL$ of $0.1 \ N \ H_2SO_4$
$III$. $6 \ g$ of urea in $1 \ kg$ of water

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$A$ person coming out of a swimming pool has $30 \ g$ of water on their body. How much heat in $kJ$ is required to evaporate this water? (The latent heat of vaporization of water is $40.79 \ kJ \ mol^{-1}$)

Similar Questions

What volume of $NH_3$ gas at $STP$ would be needed to prepare $100 \ mL$ of $2.5$ molal $(2.5 \ m)$ ammonium hydroxide solution? (Assume the density of the solution is $1 \ g/mL$)

In which of the following reactions is no gas evolved on the product side? (Temperature is maintained below the boiling point of liquids formed)

$K_2CS_3$ is called potassium ...... .

Write formulas for the following compounds:$(1)$ Mercury $(II)$ chloride$(2)$ Nickel $(II)$ sulphate$(3)$ Tin $(IV)$ oxide$(4)$ Thallium $(I)$ sulphate

The number of moles of solute present in the solutions of $I$,$II$ and $III$ is respectively:$I$. $500 \ mL$ of $0.2 \ M \ NaOH$$II$. $200 \ mL$ of $0.1 \ N \ H_2SO_4$$III$. $6 \ g$ of urea in $1 \ kg$ of water

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Write formulas for the following compounds:
$(1)$ Mercury $(II)$ chloride
$(2)$ Nickel $(II)$ sulphate
$(3)$ Tin $(IV)$ oxide
$(4)$ Thallium $(I)$ sulphate

The number of moles of solute present in the solutions of $I$,$II$ and $III$ is respectively:
$I$. $500 \ mL$ of $0.2 \ M \ NaOH$
$II$. $200 \ mL$ of $0.1 \ N \ H_2SO_4$
$III$. $6 \ g$ of urea in $1 \ kg$ of water