The number of chlorine atoms in 20 mL of chlorine gas at STP is _______ 10 21 . (Round off to the Nearest Integer). [Assume chlorine is an ideal gas at STP R = 0 . 083 L bar mol - 1 K - 1 , N A = 6 . 023 × 10 23 ]

Question

The number of chlorine atoms in 20 mL of chlorine gas at STP is _______ 10 21 . (Round off to the Nearest Integer). [Assume chlorine is an ideal gas at STP R = 0 . 083 L bar mol - 1 K - 1 , N A = 6 . 023 × 10 23 ],

MARKS App · Accepted Answer

PV = nRT 1 . 0 × 20 1000 = N 6 . 023 × 10 23 × 0 . 083 × 273 ∴ Number of Cl 2 molecules, N = 5 . 3 × 10 20 Hence, Number of Cl -atoms = 1 . 06 × 10 21 ≈ 1 × 10 21

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