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.

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