Homework Help: phy

Posted by christ on Thursday, January 24, 2013 at 10:13pm.

Calculate the change in internal energy of 2kg of water at 90 degree Celsius when it is changed to
3.30m3
of steam at
100oC
. The whole process occurs at atmospheric pressure. The latent heat of vaporization of water is
2.26×106J/kg

phy - Elena, Friday, January 25, 2013 at 6:25am
ΔQ=ΔU+W
ΔU = ΔQ – W =
=c•m•ΔT + r•m – p•ΔV=
= c•m•ΔT + r•m – p{V- (m/ρ)} =
=4190•2•10 +2.26•10⁶•2 – 101325(3.3 – 2/1000) = 4515630 J

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