Answer
Heat present in steam =msL
=150×540cal
=81000cal
Heat required by water to raise temperature from 40° to 100°
="m_s S\\Delta T"
= 250×1×(100−40)
"=15000cal"
So
steam(in cm3) is condensed into water at 100∘C is
=250+"\\frac{150\\times5}{27}=277.77cm^3"
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