Question

Calculate the Relative molecular mass of:
1. Sodium sulphate
2. Calcium nitrate
3. Sulphuric acid
4. Aluminium oxide
5. Potassium aluminate
[Atomic weights are: Na = 23,5 = 32, 0 = 16, Ca = 40, N = 14, H = 1,
Al = 27, K = 39​

Answer 1

Answer:

1. Na₂SO₄

= 2(23.5)+32+4(16)

= 47+32+64

= 143 g.

2. Ca(NO₃)₂

= 40+2[14+3(16)]

= 40+2[14+48]

= 40+2[62]

= 40+124

= 164 g.

3. H₂SO₄

= 2+32+4(16)

= 34+64

= 98 g

4. Al₂O₃

= 2(27)+3(16)

= 54+48

= 106 g

5. KAlO₂

= 39+27+2(16)

= 66+32

= 98 g

Hope this helps.