Question

Determine the mass, the grams, of each of the following substances.

A. 15.0 mol H2


B. 3.5 mol of N2


C. 2.69 mol of NaOH

Answer 1

a) molar mass H₂ = 2.0 g/mol

m = n * mm

m = 15.0 * 2.0

m = 30.0 g of H₂
_________________________
 
b) molar mass N₂ = 28.0 g/mol

m = n * mm

m = 3.5 * 28.0

m = 98.0 g of N₂
____________________________

c) molar mass of NaOH = 40.0 g/mol

m = n * mm

m = 2.69 * 40.0

m = 107.6 g of NaOH
_____________________________________

hope this helps!