2.15 g of a substance X contain 4.34 x 1022 molecules of X. Calculate the molar mass of X in g/mol.
mols X = 4.23E22/5.02AE23 = ?
mols = grams/molar mass. You know grams and mols, solve for molar mass.
mols = grams/molar mass. You know grams and mols, solve for molar mass.