Question

Calculate the heat required to convert 10g of water at 100 c to steam at 100 c the specific heat of water is 1.00 cal the heat of fusion is 80 and the heat of vap is 540

Answer 1

heat of vaporization of water will be required as water is already at it's boiling point thus heat required will be 540*10=5400 cal

Answer 2

The heat required to convert the 10 g of water at 100 °C to steam at 100 °C is 5400 cal

Data obtained from the question

• Mass of water (M) = 10 g
• Temperature (T) = 100 °C  
• Specific heat capacity (C) = 1 cal/gºC
• Heat of fusion (ΔHf) = 80 cal/g
• Heat of Vaporisation (ΔHv) = 540 cal/g
• Heat (Q) =?

Considering the question given above, the water is already at its boiling point (i.e 100 °C)

Thus, the heat needed to convert the water to steam can be obtained as follow:

How to determine the heat required

• Mass of water (M) = 10 g
• Heat of Vaporisation (ΔHv) = 540 cal/g
• Heat (Q) =?

Q = m × ΔHv

Q = 10 × 540

Q = 5400 cal

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