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Question

wht is the no of molecules present in (i) 15 l of h2 gas at stp
(ii) 0.5 g of h2 gas

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Solution

Dear Student,1. 22.4 L of H2 = 1 mole15 L = 122.4 × 15 = 0.6696 mole2) number of moles = Given Mass molar mass=0.52=0.25 moleNumber of molecules in 1 mole = 6.023 ×1023 moleculesNumber of molecules in 0.25 mole =0.25 ×6.023 ×1023 molecules = 1.505 ×1023 moleculesRegards

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