Question

One gram molecule of oxygen is heated at constant pressure from 0°C. What amount of heat should be imparted to the gas to double it's volume? Given cp = 0.218 cal g-1 0 C-1.

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Answer 1

Answer:

The answer is 7962.5 J

Explanation:

First see image,

now from 1st law of thermodynamics,

Q = W + ∆U

⇒Q = RT₀ + RT₀/(γ - 1)

for oxygen (diatomic molecule),

γ = 1.4

= 25/3 × 273 + 25/3 × 273/(1.4 - 1) J

= 2275 + 2275/0.4

= 2275 + 5687.5

= 7962.5 J

Therefore heat required to the gas to double its volume is 7962.5 J