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Q. A bubble of 8 mole of helium is submerged at a certain depth in water. The temperature of water increase by $60^{\circ} C .$ How much heat is added approximately to helium during expansion

Thermal Properties of Matter

Solution:

$Q = nc _{ p } \Delta T \left( R =2 cal / k mol ^{-1}\right)$
$Q =8 \times \frac{5 R }{2} \times 60$
$=40 \times 30 \times 2$
$=1400 cal$