what mass of c12 will contain the same number of atoms as in 3.6g of o16 ?
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Solution
Molar mass of oxygen = 16 g/mol
Moles of oxygen in 3.6 g sample is equal to : given mass / molar mass = 3.6 g / 16 g/mol of oxygen= 3.6/16 mol oxygen
Mass of C12equivalent to 3.6 / 16 mol is calculated as : Number of moles = Mass of C12 sample / Molar mass of C
Mass of C12 sample = Number of moles x Molar mass of C = 3.6/16 mol carbon x 12 g/mol = 2.7 g carbon