Question: The temperature in a surface condenser is (40^{circ} mathrm{C}) and the vacuum is (69 mathrm{~cm}) of (mathrm{Hg}) while the barometer reads (75 mathrm{~cm}) of (mathrm{Hg}).

The temperature in a surface condenser is $40^{\circ} \mathrm{C}$ and the vacuum is $69 \mathrm{~cm}$ of $\mathrm{Hg}$ while the barometer reads $75 \mathrm{~cm}$ of $\mathrm{Hg}$. Determine the partial pressure of steam and air and the mass of air present per $\mathrm{kg}$ of steam.

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