A sample of `0.1 g` of water of `100^(@)C` and normal pressure `(1.013 xx 10^(5) N m^(-2))` requires 54 cal of heat energy to convert to steam at `100^(@)C`. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample isA. `42.2 J`B. `84.5 J`C. `208.7 J`D. `104. 3 J`

A sample of `0.1 g` of water of `100^(@)C` and normal pressure `(1.013

1.	A sample of `0.1 g` of water of `100^(@)C` and normal pressure `(1.013 xx 10^(5) N m^(-2))` requires 54 cal of heat energy to convert to steam at `100^(@)C`. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample isA. `42.2 J`B. `84.5 J`C. `208.7 J`D. `104. 3 J`
Answer» Correct Answer - C `Delta Q = Delta U + Delta W` `Delta = Delta Q - Delta W = 54 xx 4.2 - P Delta V` `= 226.8 - 1.013 xx 10^(5) xx (167.1 - 0.1) xx 10^(-6)` `= 226.8 - 16.9` `~= 208.7 J`

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