How much heat energy in joule must be supplied to 14 g of nitrogen at room temperature to raise its temperature by 40° C at constant pressure? (molecular wt. of nitrogen = 28 g, R = gas constant) (gas is diatomic) (a) 50R (b) 60R (c) 70R (d) 80R

Answer: (c). n = 14/28 = 0.5 mol; diatomic Cp = 7/2R. Q = nCpΔ T = 0.5 × 7/2R × 40 Q = 70R, so the answer is (c).

How much heat energy in joule must be supplied to 14 g of nitrogen at… | MHT CET 2026 (15 May, Shift 1)

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Thermodynamic Processes

How much heat energy in joule must be supplied to $14$ g of nitrogen at room temperature to raise its temperature by $40^\circ$ C at constant pressure?

(molecular wt. of nitrogen = $28$ g, $R$ = gas constant) (gas is diatomic)

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Answer: (c)

$n = \dfrac{14}{28} = 0.5$ mol; diatomic $C_p = \dfrac{7}{2}R$ .
$Q = nC_p\Delta T = 0.5 \times \dfrac{7}{2}R \times 40$
$Q = 70R$ , so the answer is (c).

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