Question

what is the mass of calcium oxide if calcium is 40 and oxygen is 16 (choose the correct answer,)
a28
b.56
c.72
d.48​

Answer 1

the ans is b) 56.I hope it helps

Answer 2

Calcium Oxide ------》Calcium + Oxygen

CaO----------------------》 Ca + O2

Explanation:

Therefore , CaO = 1(40) + 2(16)

= 40 + 32

= 72

So your answer is (C) 72