Question

Tia has a sample of pure gold (Au). She weighed the sample and the result was 52.9 grams. Tia wants to determine the number of atoms in the sample. Calculate the number of atoms in 52.9 g of pure gold. Au atoms

Answer 1

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Dear Student, weight of Au sample= 52.99 Atomic mass of All ~ 196.97g /mol Thus, no. of moles of Au= mass of All atomic mass of Au = 52.98 196.98g mal = 0.268 moles 23 1 mol of any substance contains 6.022610 atoms This number of Au atome = 0.268 * 6.022x1023 atoms = 1.614x10 23 Au atoms Best wishes !!