A monatomic ideal gas expands at constant pressure, with heat Q supplied. The fraction of Q which goes as work done by gas is

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\frac{2}{3}

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\frac{3}{5}

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\frac{2}{5}

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Solution

The correct option is D $\frac{2}{5}$
$Q = n C_{p} Δ T$ and $W = P Δ V = n R Δ T$
monatomic gas, $C_{p} = \frac{5 R}{2}$ .
$\Rightarrow$ $\frac{W}{Q} = \frac{2}{5}$

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A monatomic ideal gas expands at constant pressure, with heat Q supplied. The fraction of Q which goes as work done by gas is

The correct option is D 25Q=nCpΔT and W=PΔV=nRΔTmonatomic gas, Cp=5R2.⇒WQ=25

The correct option is D $\frac{2}{5}$
$Q = n C_{p} Δ T$ and $W = P Δ V = n R Δ T$
monatomic gas, $C_{p} = \frac{5 R}{2}$ .
$\Rightarrow$ $\frac{W}{Q} = \frac{2}{5}$