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Calculate the amount of heat that must b...

Calculate the amount of heat that must be supplied to raise the temperature of 2 kg of water from `25^(@)C` to its boiling point at one atmospheric pressure. The average specific heat of water in the range `25 - 100^(@)C` is `4.184 JK^(-1) g^(-1)`.

A

628 kJ

B

418.4 kJ

C

209.2 kJ

D

108.6 kJ

Text Solution

Verified by Experts

The correct Answer is:
A
Heat required for heating = `m xx C_(s) xx Delta T`
`m = 2000g, Delta T = 100 - 25 = 75^(@)`,
`C_(s) = 4.184 JK^(-1) g^(-1)`
Heat required = `2000 x 4.184 xx 75`
`= 6.28 xx 10^(5) J`
or = 628 kJ
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