Question

Calculate the molar mass of the following:
(i) H2O (ii) CO2 (iii) CH4..
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Answer 1

Answer:

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(i) H2O:The molecular mass of water, H2O= (2 × Atomic mass of hydrogen) + (1 × Atomic mass of oxygen)

= [2(1.0084) + 1(16.00 u)]

= 2.016 u + 16.00 u

= 18.016

= 18.02 amu....

(ii) CO2:The molecular mass of carbon dioxide,

CO2= (1 × Atomic mass of carbon) + (2 × Atomic mass of oxygen)

= [1(12.011 u) + 2 (16.00 u)]

= 12.011 u + 32.00 u

= 44.01 amu...

(iii) CH4:The molecular mass of methane, CH4= (1 × Atomic mass of carbon) + (4 × Atomic mass of hydrogen)

= [1(12.011 u) + 4 (1.008 u)]

= 12.011 u + 4.032 u

= 16.043 amu....

Answer 2

Answer:

(i) H2O

1×2 + 16 = 18 u

(ii) CO2

12×1 + 16×2 = 44 u

(iii) CH4

12×1 + 1×4 = 16