Question

How do you work this out without a calculator ca(NO3)2

Answer 1

There's no question here.

Answer 2

To find the molar mass first apply the 2 to N and O
Then you will do
Ca 1 x 40.1=40.1
N 2 x 14= 28
O 6 x 16 = 96

so the Molar mass of Ca(NO3)2 is 164.1 grams per mol.