Question

0.2 mole of M2O3 weighs 32.0 grams. Calculate atomic weight of M.

Answer 1

Answer:

56 g

Explanation:

0.2 mole M2O3 weighs 32.0 g

1 mole weighs 32/0.2 = 160 g

1 mole M2O3 contains 3 moles of O atoms and 2 moles of M atoms

160 g = 2 M + 3O = 2M + 3(16)

160-3(16) = 2M

112 = 2M

M = 112/2 = 56 g