Question
Work out the heat change (cal) when 40 ~g of He gas at 27^ C undergoes isothermal and reversible compression from initial pressure of 1 ~atm to 10 ~atm ( R =2 cal K ^ -1 ~mol ^ -1 ).
BITSAT
Chemistry
Thermodynamics (C)
2021
BITSAT 2021
BITSAT Chemistry Question (2021) — Solution
Options
- A. 13.818 kcal
- B. -13.818 kcal
- C. 55.272 kcal
- D. -55.272 k cal
Answer
B. -13.818 kcal
Step-by-step solution
aligned q &=- w _ rev =- (-2.303 nRT P _ 1 P _ 2 ) \\ &=2.303 40 4 2 300 1 10 =-13.82 kcal aligned
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