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NEET levelSingle correct optionDifficulty 1 of 3td022

Heat required to raise the temperature of $2 mol$ of a monatomic ideal gas by $10 K$ at constant volume ( $R = 8.314 J mo l^{- 1} K^{- 1}$ ) is

A $249.4 J$
B $415.7 J$
C $124.7 J$
D $166.3 J$

Answer: A

q_{V} = n C_{V} Δ T = (2) (\frac{3}{2}) (8.314) (10) = 249.4 J

. The value using

\frac{5}{2} R

is the constant-pressure heat.

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