Question

32 g of a metal, M, reacts with 8 g of oxygen to form an oxide. The formula of the oxide
is MO. What is the atomic mass of M in g mol-1
?

A. 16
B. 32
C. 64
D. 128

Answer 1

Answer:

128

Explanation:

atomic mass of one oxygen is 16g, if 8 grams of oxygen reacts with metal M to form M, the atomic mass of M must be 128

Answer 2

Answer:

2M + O₂ → 2MO

M.M.=? 32g

m= 32g 8g

n=0.5mol. 0.25mol.

as, M.M=m/n

so, M.M=32÷0.5=64g/mol

Therefore,

mass of Metal 'M' is 64 grams per mole