1.

Calculate the molar mass of the following substances : (a) Ethyne, CH_(2) (b) Sulphur molecule, S_(8) (c) Phosphorus molecule, C_(4) (atomic mass of Phosphorus = 31) (d) Nitric acid, HNO_(3) Hydrochloric acid, HCl

Answer»

SOLUTION :Ethyne, CH Molar MASS of ethyne, `C_(2)H_(2) = 2x12+2x1`
`=26g`
(b) SULPHUR molecule `S_(8)`
Molar mass of Sulphur molecule,
`S_(8)=8x32=256g`
(c) Phosphorus molecule `P_(4)`
`P_(4)=4x31`
`=124g`
(d) Hydrochloric acid, HCl (E) Nitric acid, `HNO_(3)`
Molar mass of Nitric acid `HNO_(3)+1+14+3x16=63g`


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