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Determine the leatent heat of vaporizati...

Determine the leatent heat of vaporization of unknonw substance X in kcal`//` g if 3.0g of boiling liquid X are completely vaporized in 1.5 hours by an input of 10 kcal `//` h into the system by an energy source.

A

5 kcal `//` g

B

1.5 kcal` //` g

C

27 kcal` //` g

D

30 kcal `//` g

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The correct Answer is:
A
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