Question

¡) write the chemical formula for the following. a)hydrogen chloride. b)calcium carbonate. ¡¡)define the molecular mass of a substance.​

Answer 1

i) a) Hydrogen chloride - HCl

  b) Calcium carbonate - CaCO3

ii) Molecular mass of a substance:

               Molecular mass is a number equal to the sum of the atomic masses of the atoms in a molecule. The molecular mass gives the mass of a molecule relative to that of the 12C atom, which is taken to have a mass of 12. Molecular mass is a dimensionless quantity, but it is given the unit Dalton or atomic mass unit as a means of indicating the mass is relative to 1/12th the mass of a single atom of carbon-12.The base SI unit for molar mass is kg/mol.

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Answer 2

Answer

A)HCl

B)CaCo3

ii) Molecular mass of a substance is mass of atoms present in it calculated in units

Eg:- mol mass of HCl will be sum of atomic mass of Hydrogen and chlorine.