1 mole of ammonia is of 17 g. Then what is the mass of 0.3 moles

1-mole-of-ammonia-is-of-17-g-then-what-is-the-mass-of-0-3-moles

1 mole of ammonia is of 17 g. Then what is the mass of 0.3 moles of ammonia?
A. 21g
B. 2.1g
C. 17g
D. 1g

The correct answer is B. 2.1g

Given that, 1 mole of ammonia is of 17 g. 0.3 mole of ammonia contains 17 x 0.3g of mass. IT’s because the molecular weight of a given pcompound is directly proportional to the number of moles of the given compound.