Question 936: Thermodynamics & KTG

Question

A sample of 0.1 g of water at 100°C and normal
pressure (1.013 × 10
5
N m
–2
) requires 54 cal
of heat energy to convert to steam at 100°C.
If the volume of the steam produced is 167.1 cc,
the change in internal energy of the sample, is

Accepted Answer

Using first law of thermodynamics,
$$\Delta $$Q = $$\Delta $$U + $$\Delta $$W
$$ \Rightarrow $$ 54 ÃÂ 4.18 = $$\Delta $$U + 1.013 ÃÂ 10
5
(167.1 ÃÂ 10
Ã¢ÂÂ6
Ã¢ÂÂ 0)
$$ \Rightarrow $$ $$\Delta $$U = 208.7 J

Answer

104.3 J

Answer

208.7 J

Answer

42.2 J

Answer

84.5 J

Thermodynamics & KTG

A sample of 0.1 g of water at 100°C and normal pressure (1.013 × 10 5 N m –2 ) requires 54 cal of heat energy to convert to steam at 100°C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample, is

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