20.09.19: Atomic theory test (1,2,3,4,7)

Question 1

Mr of magnesium hydrogencarbonate

Answer 1

146

Question 2

what mass of nitrogen is in 6g of NH4NO3?

Answer 2

Mr of NH4NO3: 80
6/80 = 0.075
N:NH4NO3 = 2:1
0.075 x 2 = 0.15
Ar of N = 14
0.15 x 14 = 2.1 grams