0.356 grams of an unknown metal reacts with oxygen to form 452 milligrams of the metal oxide. Identify the metal

Answer 1

Do I assume it forms MO2?
.....2M + O2 ==> 2MO2
..0.356..0.096...0.452
mols O2 = 0.096/32 = 0.003
mols M = 0.003 x 2 = 0.006
molar mass = grams/mol = 0.356/0.006 = 118.7. Look this up on the periodic table.