Converting Between Number of Molecules and Mass of a Compound: What is the mass of 4.78 × 1024 NO2 molecules?

RELATIONSHIPS USED

6.022 × 1023 molecules = 1 mol (Avogadro’s number)

NO2 molar mass = 1(Atomic mass N) + 2(Atomic mass O)

= 14.01 + 2(16.00)

= 46.01 g/mol

SOLUTION