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juin [17]
3 years ago
14

7. How many joules of energy do I need to change 2 grams of water from 0°C solid water to 0° liquid water?

Chemistry
1 answer:
Ratling [72]3 years ago
4 0

7. D. 668 joules

8. B. 3 grams

<h3>Further explanation</h3>

Given

2 grams of water

6768 joules of energy

Required

Energy

Mass of water

Solution

The heat to change the phase can be formulated :

Q = m.Lf (melting/freezing)

Q = m.Lv (vaporization/condensation)

Lf=latent heat of fusion

Lv=latent heat of vaporization

7. phase change (ice to water)⇒Heat of fusion water=334 J/g

Q = 2 g x 334 J/g

Q = 668 J

8. phase change(water to vapor)⇒heat of vaporization water=2260 J/g

6768 J = m x 2260 J/g

m = 3 g

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