Will you help me in chemistry?

Question

when a metal oxide of valency 1, of a weight 128g is focused to reduction .112g of the metal is remained.find the relative atomic mass of the metal?

Answer 1

(128 grams M2O)  - (112 grams of metal) = 14 grams of oxide

14 g of oxygen @ 16 g/mol = 0.875 moles of oxygen atoms

0.875 moles of oxygen atoms is combined with twice that , or 1.75 moles of metal

112 g metal / 1.75 moles = 64 grams /mole

your answer is: the relative atomic mass of the metal is 64

likely copper forming Cu2O