Calculate the molecular mass of C₂H₂. (Given - atomic mass of C=12 and H = 1)
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Class 11
>>Chemistry
>>Some Basic Concepts of Chemistry
>>Atomic and Molecular Masses
>>Calculate the molar mass of the followin
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Calculate the molar mass of the following substances.
(a) Ethyne, C
2
H
2
(b) Sulphur molecule, S
8
(c) Phosphorus molecule, P
4
(Atomic mass of phosporus =31)
(d) Hydrochloric acid, HCl
(e) Nitric acid, HNO
3
Medium
Solution
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(a) Ethyne (C
2
H
2
) = 2×Mass of C atom+2×Mass of H atom=2×12+2×1=24+2=26 g/mol
(b) Sulphur dioxide (S
8
)=8×Mass of sulphur atom=8×32=256 g/mol
(c) P
4
=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) HNO
3
=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:
Molecular mass of C2H2 is 2(12)+2(1)=24+2=26
Therefore, the molecular mass of C2H2 is 26.
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