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Calculate the molar mass of the following substances (a) Ethyne C2H2 (b) Sulphur molecule S8 (c) Phosphorous molecule P4 (d) Nitric acid HNO3 (e) Hydrochloride acid HCl.

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Molar mass of ethyne C2H2
Atomic mass of C = 12 amu
Atomic mass of H =1 amu
2(12) + 2(1) = 26 amu
Molar mass of ethyne = 26 amu

Molar mass of sulphur S8
Atomic mass of Sulphur=32 amu
8(32)=256 amu
Molar mass of sulphur= 256 amu

Molar mass of Phophorous molecule P4
Atomic mass of phosphorus= 31 amu
4(31)= 124 amu
Molar mass of phosphorus= 124 amu
Molar mass of HNO3
Atomic mass of H =1 amu
Atomic mass of N =14 amu
Atomic mass of O =16 amu
1+14+3(16 )= 63 amu
Molar mass of HNO3 = 63 amu

The molar mass of HCl
The atomic mass of H = 1 amu
The atomic mass of Cl = 35.5 amu
1+35.5=36.5 amu
Molar mass of HCl = 36.5 amu

Final Answer-

The molar mass of ethyne = 26 amu
The molar mass of sulphur= 256 amu
Molar mass of phosphorus= 124 amu
The molar mass of HNO3 = 63 amu
Molar mass of HCl = 36.5 amu

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