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Massa molar adalah hubungan masssa dengan jumlah mol.
Untuk atom :
Massa molar (gr/mol) = massa atom relatif (sma)
Mm = Ar (sma)
Mol unsur X = 3,01 x 10^22 / 6,02 x 10^23 x 1 mol = 0,05 mol
Massa molar X = gram / mol
Massa molar X = 2 / 0,05
Massa molar X = 40 gram