Question

Calculate the percentage composition of calcium in quick lime [ CaO ] is (Ca = 40, O = 16)​

Answer 1

Answer:

Ca :O

40:6

20:3 is the percentage composition by mass

Answer 2

Answer:

71.47 %

Explanation:

The Atomic Mass of the Elements are:

Calcium - Ca = 40 a.m.u.

Oxygen - O = 16 a.m.u.

Now, Total Mass of the compound

= (40×1) + (16×1)

= 40 + 16

= 56 a.m.u.

Now composition of Calcium

$= \frac{40}{56} \times 100$

$= 71.47 \: \%$

So Percentage composition of Calcium in Quick Lime is 71.47 % ..