12.2 What amount of heat must be supplied to 2.0 × kg of nitrogen (at room temperature) to raise its temperature by 45 °C at constant pressure? (Molecular mass of N2 = 28; R = 8.3 J mol–1 K–1.)
12.2 What amount of heat must be supplied to 2.0 × kg of nitrogen (at room temperature) to raise its temperature by 45 °C at constant pressure? (Molecular mass of N2 = 28; R = 8.3 J mol–1 K–1.)
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1 Answer
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Mass of Nitrogen, m = 2.0 × kg = 20 g
Rise in temperature, = 45 °C
Molecular mass of . M = 28
Universal gas constant, R = 8.3 J mol–1 K–1
Number of moles, n = = = 0.714
Molar specific heat at constant pressure for nitrogen, = R = 29.05 J/mol/K
The total amount of heat to be supplied is given by the relation
Q = n = 0.714 = 933.38 J
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