Question

It was found that 3.0 g of M reacts with 1.0 g of oxygen to form the compound MO3. What is the atomic weight of M?

Answer 1

144

Step-by-step explanation:

The balanced equation would be :

M + 3 O ===> MO3

1 g of oxygen is 1/16 of a mole

It takes 1/3 as many moles of M to complete the reaction , or 1/48 mole

and 1/48 mole is 3 gm so atomic weight is 3 (48) = 144 u