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storchak [24]
3 years ago
11

How many joules are released when 30.0 g of H2O(g) condenses at 100°C and cools to 10°C

Chemistry
1 answer:
I am Lyosha [343]3 years ago
4 0

Heat released : 79086 J

<h3>Further explanation</h3>

Condenses :

1. phase change (gas - liquid) : heat of vaporization (ΔH vap for water = 2260 J/g)

2. cools from 100 - 10 : (Q=m.cΔT)

1. Q=m.ΔH vap

\tt Q=30\times 2260=67800~J

2. Q=mc.ΔT(c water = 4.18 J/g C)

\tt Q=30\times 4.18\times (100-10)\\\\Q=11286~J

Q tot = 67800 + 11286 = 79086 J

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