Question

Calculate
the percentage by weight
of
a) carbon in carbon dionide
b) sodium in sodium carbonate
c) aluminium in aluminum nitride
[ C= 12, O = 16, H= 1, Na = 23, AL= 27, N=14]​

Answer 1

Answer:

b

Explanation:

Answer 2

Answer:

to know th % by weight of any element in compound divide = atomic mass of that element × 100

molecular mass

Explanation:

a) 12/ 44 × 100 = 27.27%

b) 23/106×100 = 21.6%

c) 27/41 ×100=65.85%