Question

verify by calculating 120 gram of calcium and 120 gram of magnesium elements have a mole ratio of 3:5

Answer 1

please see image for soln.

Answer 2

Mol weight of Ca equal to 40 mole weight of mg is equal to 24 therefore in 40 gram of Ca is equal to one mole 120 gram of Ca is equal to 3 moles 24 gram of moles 120 MG Road to 120 by 24 is equal to 5 mole ratio

3:5