Question

Out of 20 g K2CO3 and 5 g K2CO3, one which has higher percentage of potassium is (at. wt. of K = 39, C = 12, O = 16)
1. 20 g K2CO3
2. 5 g K2CO3
3. Both will have same percentage
4. It cannot be calculated by the given data

Answer 1

Answer:

20 g of K2CO3 has high percentage oh K.

Answer 2

1.20 g K2CO3 has higher percentage of potassium

The atomic mass of potassium = 39

This compound has 2 potassium molecule then = 39 × 2 = 78

The compound has total carbon molecule 1 and the weight of carbon = 12 ×1= 12

Oxygen molecule present in this compound is 16×3= 48

Adding this totally 39 + 78 + 12 + 48 = 138u