![]() Number of moles of CH 4 = n = Given mass of CH 4 / Molecular mass of CH 4 Molecular mass of methane (CH 4) = 12 × 1 + 1 × 4 = 12 + 4 = 16 g To Calculate Number of Molecules in a Given mole:Ĭalculate the number of moles and number of molecules of following. Number of moles of C = Given mass of C/ Molecular mass of C Hence molecular mass of C = Atomic mass of C = 12 g Number of moles of Al = Given mass of Al / Molecular mass of Al Hence molecular mass of Al = Atomic mass of Al = 27 g Given mass of Al = 1.46 metric tons = 1.46 × 10 3 kg Number of moles of Ca = Given mass of Ca / Molecular mass of Ca Hence molecular mass of Ca = Atomic mass of Ca = 40 g Number of moles of Fe = Given mass of Fe / Molecular mass of Fe Hence molecular mass of Fe = Atomic mass of Fe = 56 g Number of atoms = Number of molecules × Atomicity Conversions: FromĬalculate the number of moles of following. V = Given volume, V = Molar volume = 22.4 dm 3
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