Twelve parts by mass of a carbon...

Question

Twelve parts by mass of a carbon will combine with 16 parts by mass of oxygen to form a gas. How many grams of the gas can be formed using 12 g of carbon and a sufficient amount of oxygen?

Answer 1

 

12 g of C = 1 mole of C

16 g of O = 1 mole of O

Combining them in a mass ratio of 12 C : 16 O ==> 1 mole CO = 28 g assuming sufficient O is present.