Question

Calculate the number of moles in 2400 g of (i) CO2
, (ii) Oxygen molecule
(iii) Caco, (iv) MgBr2​

Answer 1

Answer:

1) 54.5

2) 75

3) 24

4) 13.04

Explanation:

formula:

                   no. of moles = given mass/molecular mass

given mass = 2400

1) molecular mass of CO2 = 44

                     no. of moles of CO2 = 2400/44 = 54.5

2) Molecular mass of O2 = 32

                     no. of moles of O2 = 2400/32 = 75

note: Atomic mass of single oxygen atom is 16 but here we are talking about oxygen molecule which consists of 2 oxygen atoms (O2) so we will consider it's molecular mass (16 x 2 = 32)

3) molecular mass of CaCO3 = 100

                       no. of moles of CaCO3 = 2400/100 = 24

4) molecular mass of MgBr2 = 184

                    no. of moles of MgBr2 = 2400/184 = 13.04