Question

Calculate the joules of energy involved when 11 grams of water at 10.0 degrees Celsius cools and then freezes at 0.0 degrees Celsius.

How many kilocalories are required to raise the temperature of 305 gtams silver from 30 degrees Celsius to 70 degrees Celsius? (spec. heat of Ag =0.0g cal/g degrees Celsius)

Thanks =)

Answer 1

q1 = heat released to cool water from 10 C to zero C.
q1 = mass water x specific heat water x (Tfinal-Tinitial).

q2 = heat released to freeze liquid water at zero C to solid ice at zero C.
qw2 = mass water x heat fusion.

Total q = q1 + q2

Answer 2

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