Calculate the molecular masses of the following (a) Hydrogen, H2
(b) Oxygen, O2
(c) Chlorine, Cl2
(d) Ammonia, NH3
(e) Carbon dioxide, CO2
(Atomic masses H = 1 u ; O = 16 u ; Cl = 35.5 u ; N = 14 u ; C = 12 u)
Answers
Answer:
hydrogen =2
Oxygen =16×2=32
chlorine=35.5×2=71
Ammonia =14×1+1×3=17
carbon dioxide =12×1+16×2=44
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The molecular masses are:
(a) Hydrogen: 2u
(b) Oxygen: 32u
(c) Chlorine: 71u
(d) Ammonia: 17u
(e) Carbon dioxide: 44u
Explanation:
The sum of all the elements’ atomic masses is called the molecular mass. It is expressed in atomic mass units (u).
(i) The Molecular mass of H2 = 2H atoms mass x Hydrogen’s atomic mass
= 2x1 = 2u.
(ii) The Molecular mass of O2 = 2O atoms mass x Oxygen’s atomic mass
=2x16 = 32u
(iii) The Molecular mass of Cl2 = Mass of 2Cl x Chlorine’s atomic mass
= 2 X 35.5 = 71 u
(iv) The Molecular mass of NH3 = Mass of N + Mass of 3 H atoms x Hydrogen’s atomic mass
= 14 + 3 (1) = 17 u
(v) Molecular mass of C02 = Mass of C + Mass of 2 oxygen atoms x Oxygen’s atomic mass
= 12 + 2 X 16 = 12 + 32 = 44 u
You can get all the answers of Chapter 3 in the link below:
https://brainly.in/question/15041870
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