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Physics Question on CHANGE OF STATE

Water standing in the open at 32oC{{32}^{o}}C evaporates because of the escape of some of the surface mole cuels. The heat of vaporisation (540 cal/g) is approximately equal to ε\varepsilon n, where ε\varepsilon is the average energy of the escaping molecules and n is the number of molecules per gram. The value of ε\varepsilon is close to

A

1.62×10−20J1.62\times 10^{-20}J

B

4.23×10−20J4.23\times 10^{-20}J

C

6.75×10−20J6.75\times 10^{-20}J

D

8.31×10−20J8.31\times 10^{-20}J

Answer

6.75×10−20J6.75\times 10^{-20}J

Explanation

Solution

Answer (c) 6.75×10−20J6.75\times 10^{-20}J