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298 K ताप तथा 40k Pa दाब पर किसी गैस के 2 m3 आयतन में अणुओं की संख्या ज्ञात कीजिए।

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PV = nRT

n = PV/RT

P = 40k Pa = 40 x 103 Pa V = 2 m

T = 298 K, R = 8.314 J K - 1 mol-1

\(n = \frac{(40\times 10^3\ Pa)\ (2\ m^3)}{(8.314JK^{-1}\ mol^{-1})\times (298\ K)}\) 

n = 32.28 mol (1 Pa = 1 J m3)

अणुओं की संख्या = मोल x आवोगाद्रो संख्या 

= 32.28 × 6.022 x 1023 

= 1.94 × 1025

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