Question

:) Calculate the total number of electrons present in 1.6 g of methane (CH4).
) Calculate the average atomic mass of chlorine using the following data.
% Natural abundance
Molar
mass
35CI
75.77
34.9689
36.9659
3TCI
24.23​

Answer 1

Answer:(i) No. of molecules in 1.6g of methane

Molar mass of methane (CH4)=12+4×1=16g

16 g of methane contain molecules =6.022×1023

1.6 g of methane contain molecules =6.022×1023(16g)×(1.6g)=6.022×1022

(ii) No. of electrons in 6.022×1022 molecules of methane

1 molecule of methane contains electrons =6+4=10

6.022×1022 molecules of methane contain electrons =6.022×1022×10=6.022×1023.

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