Question

Calculate the molar mass of the given substances:-

a) CaCl2 and b) H2SO4 (given that: H=1, O = 16, S=32, Ca = 40 and Cl =35.5)​

Answer 1

1) N H 3

atomic mass of N + 3 ( atomic mass of hydrogen )

= 14 +3

= 17u

2) H 2 S O 4

= 1 × 2 + 32 + 16 × 4

= 2 + 32+ 64

= 98u

3) C A C L 2

Atomic mass of C A = 40

Atomic mass of C L = 35.5(2)

Formula unit mass of C A C L 2 = 111 u

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