If you add 500 kj of heat to 500 g of water at 50.0°c, how much water is left in the container? the latent heat of vaporization of water is 2.26 ×103 j/g and its specific heat is is 4.190 j/(g∙k)

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08-05-2018
Chemistry

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If you add 500 kj of heat to 500 g of water at 50.0°c, how much water is left in the container? the latent heat of vaporization of water is 2.26 ×103 j/g and its specific heat is is 4.190 j/(g∙k)

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superman1987 superman1987 · Answer 1 · 2018-05-17T15:28:42+02:00

First, we will get the heat required to raise the 500 g of water from 50°C to 100°C = m*C*ΔT

when m is the mass = 500 g

and C is the specific heat capacity of water = 4.19

ΔT change in temperature = 50 °C

by substitution:

q = 0.5 Kg * 4.19 * 50°C

=104.75 KJ

∴ heat left to boil the water= 500KJ - 104.75KJ = 395 KJ

the heat required to boil water from 100°C to steam = mass *latent heat of vaporization

395KJ = M * 2.26 x 10^3

Mass = 0.17Kg = 170 g

∴ water remain= 500 g - 170 = 330 g