Atomic Mass of HCl

Q. 1 mole of $HCl$ contains grams of it.

1. 36.5
2. 35
3. 18

Q. How many moles of ${\text{CaCO}}_3$ are present in 500 g of ${\text{CaCO}}_3$?
Gram atomic masses Ca, C, and O are 40, 12, and 16 respectively.

1. 10
2. 8
3. 5
4. 6