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Gibbs Free Energy & Spontaneity

How much ener...

Question

How much energy is required to rise the temperature of $100 g$ water from $24^{o}$ C to $90^{o}$ C.The specific heat of water is $1.0 c a l / g K$

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Solution

Given : $S = 1 c a l / g K$ $m = 100 g$
Change in temperature $Δ T = 90 - 24 = 66^{o} C$
Heat required $H = m S Δ T = 100 \times 1 \times 66 = 6600 c a l$

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