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How many joules of heat are absorbed whe...

How many joules of heat are absorbed when 70.0 g of water is completely vaporised at its boiling point? (`L_(v)`=2260 kJ/kg)

A

`23.4 kJ`

B

`7.0 kJ`

C

`15.81 kJ`

D

`158.7 kJ`

Text Solution

Verified by Experts

Since the process involves phase hange, heat absorbed, Q = mass `xx ` latent heat of vaporisation
Given, mass `= 70. 0 g = 0. 07 kg , L _(v) = 2260 kJ // kg therefore Q = 0.7 xx 2260 kJ = 158 . 2 kJ`
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