Question

2021
calculate the percentage by
weight of a) "carbon in
carbon dionide
b) Sodium in sodium sodium
carbonate . c) Aluminium in Aluminium
Nitride
C c= 12 0=16, H=1, Na=28 A1=27, N = 14​

Answer 1

Given,

Molar Mass:

Carbon Dioxide = (12+16*2) g

= 44 g

Sodium Carbonate = (23+12+48) g

= 83 g

Aluminium Nitride = (27+14) g

= 41 g

1. Carbon Percentage = (12/44)*100%

= 27.27%

2. Sodium Percentage = (23/83)*100%

= 27.71%

3. Aluminium Percentage = (27/41)*100%

= 65.85%

I hope this helps.