Question

When 6.50 moles of Calcium oxide

decomposes, how many moles of oxygen
gas are produced.
2 Cal --) 2 Ca + O2

A) 6.50 moles 0₂
B) 13.0 moles 0₂
C) 3.25 moles 0₂

Answer 1

A) 6.50 moles 0₂

Step-by-step explanation:

In the reaction, 2 moles of Calcium oxide decomposes to produce 2 moles of Calcium and 1 mole of Oxygen gas.

So, when 6.50 moles of Calcium oxide decomposes, 6.50 x (1 mole O₂ / 2 moles Calcium oxide) = 6.50 x 0.5 = 3.25 moles of Oxygen gas will be produced.

And as 3.25 x 2 = moles O₂,