Heat and Thermal ExpansionHard

Question

When unit of water boils to become steam at 100oC, it absorbs Q amount of heat. The densities o water and steam at 100o C are ρ1 and ρ2 respectively and the atmospheric pressure is ρ0. The increase in internal energy of the water is : -

Options

A.Q
B.Q + P0
C.Q + P0
D.Q - P0

Solution

Q = ᐃU + W ⇒ +Q = ᐃU + P0 (V0 - V0)
⇒Q = ᐃU + P0 ᐃU = Q + P0

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