How many kJkJ of heat are needed to raise the temperature of 15.00 kgkg of liquid...

Question

Question

How many kJkJ of heat are needed to raise the temperature of 15.00 kgkg of liquid water from 24.4 °C to 46.3 °C ?

science chemistry

Answer 1

Answer #1

Heat absorbed or released is given by

Q = m CpT

where Q is the heat released or absorbed.

m = mass of water = 15 kg = 15000 g

Cp = specific heat capacity of liquid water = 4.2 J/g degree celsius ( from standard data )

T = temperature difference = 46.3 - 24.4 = 21.9 degree celsius

so, Q = 15000 x 4.2 x 21.9 = 1379700 J = 1379.700 kJ heat will be absorbed

Answer 2

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