Heat of Vaporization Heat of Fusion

How many Joules of energy are required to make 100 grams of ice at 0 ^οC completely melt? The specific latent heat of fusion of ice is 334000 J/kg

• 200 J
• 400 J
• 33,400 J
• 2,000,000 J

Calculate the amount of energy required to melt 35.0 grams of ice.
(not in sig figs)  H_f = 80.0 cal/g,  H_v = 560.0 cal/g, S_H = 1.00 cal/g ºC

• 19,600 cal
• 35.0 cal
• 2,800 cal 
• 1,568,000 cal 

How many calories are required to boil 75 grams of water?
(not in sig figs)  H_f = 80.0 cal/g,  H_v = 560.0 cal/g, S_H = 1.00 cal/g ºC

• 6,000 cal
• 3,360,000 cal
• 42,000 cal
• 7.46 cal

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A substance is condensing. Which formula should you use?

• Q= mHf

• Q= mTCp

• Q= mHv

In which region of the graph would use the latent heat of vaporization(ΔH_vap) to calculate heat energy?

• Region 2
• Region 3
• Region 4
• Region 5

In which region of the graph would use the latent heat of fusion(ΔHfus) to calculate heat energy?

• Region 2
• Region 3
• Region 4
• Region 5

Tags

NGSS.HS-PS3-1

The heat absorbed by melting a solid is known as

• latent heat of fusion

• latent heat of solid

• latent heat of liquid

• latent heat of vaporisation