Calculate the mass of 3 g molecules of HNO3 ?
1gram molecule of any compound is the molecular mass of the compound expressed in grams or mass of 1 mole (i.e. 6.022 ×1023 particles) of compound.
so, mass of 1gram molecule of HNO3 = 63 g.
and so, mass of 3gram molecules of HNO3 = 63 ×3 g.
= 189 g.