Question

What is the mass in grams of 2.70 moles of zinc (II) oxide?

Answer 1

219.73 g

Step-by-step explanation:

The molecular formula of zinc (II) oxide is ZnO. This means its molar mass would be:

• Molar Mass of ZnO = (Atomic Mass of O) + (Atomic Mass of Zn)

• Molar Mass of ZnO = 16 + 65.38 = 81.38 g/mol

With that molar mass, we can convert moles into grams:

• mass = moles * molar mass

• mass = 2.70 moles * 81.38 g/mol = 219.73 g