Question

b. What is the mass of 0.4 moles of Calcium Carbonate. [Ca=40u, C = 12 u]​

Answer 1

Answer:

The mass of 0.4 moles of CaCO3 = 40g

Explanation:

Gram molecular mass of CaCO3 = 100g

1 mole of CaCO3 = 100g

0.4 moles of CaCO3 = ?

0.4 x 100 = 40g

Answer 2

Given:

The moles of calcium carbonate = 0.4

To find:

Mass of 0.4 moles of calcium carbonate.

Solution:

The molecular mass of Calcium carbonate is,

The atomic weight of Calcium + the atomic weight of carbon + 3 times the atomic weight of Oxygen.

Therefore, the mass of calcium carbonate is

= 40 + 12 + 3 x 16

= 100 grams

As we know, one mole of any substance is equal to the molecular mass of the substance.

Therefore 1 mole of calcium carbonate = 100 grams.

So, for 0.4 moles the mass of calcium carbonate is,

0.4 x 100 = 40 grams.

Hence, the mass of 0.4 moles of calcium carbonate is 40 grams.