Question

Calculate the molar mass of the following substances:
a) Al(SO4)3
b)CaCO3
c)Na2SO4
(Atomic mass of - Al=27,S=32,O=16,Ca=40,C=12,Na=23)​

Answer 1

Explanation:

Answer

(a) Ethyne (C2H2) = 2×Mass of C atom+2×Mass of H atom=2×12+2×1=24+2=26 g/mol

(b) Sulphur dioxide (S8)=8×Mass of sulphur atom=8×32=256 g/mol

(c) P4=4×Mass of P atom=4×31=124 g/mol

(d) HCl=1×Mass of H atom+1×Mass of Cl atom=1+35.5=36.5 g/mol

(e) HNO3=1×Mass of H atom+1×Mass of N atom+3×Mass of O atom

=1×1+1×14+3×16=63 g/mol

Answer 2

a) = 342.14g/mol

b) = 100.09g/mol

c) = 142g/mol