Find the molecular mass of the following
o CaCO3
o NaOH
o H2SO4
o Mg(NO3)2
Answers
What is molecular mass?
Molecular mass is the total mass of a molecule which is equal to the sum of all the masses present in the molecule.
How to find Molecular mass?
Step -1: From the chemical formula note down the number of atoms of each element in the compound.
Step-2 : Multiply the atomic weight of each element with its number of atoms.
Step -3 : Add up all masses obtained after multiplication.
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Calculation of Molecular mass:-
(i)CaCO3
Atomic weight of,
=> Ca = 40,
=>C=12,
=>O=16
Molar mass = 40(1) + 12(1)+16(3)
=40+12+48
=100g/mol.
Therefore,
Molecular mass of CaCO3 is 100g/mol.
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(ii)NaOH
Atomic weight of,
=> Na = 23
=> O = 16
=> H = 1
Molar mass = 23(1)+16(1)+1(1)
=39g/ mol
Therefore,
Molecular mass of NaOH is 39g/mol.
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(iii)H2SO4
Atomic weight of ,
=>H= 1
=> S=32
=> O = 16
Molar mass = 1(2)+1(32)+4(16)
= 98g/mol
Therefore,
Molecular mass of H2SO4 is 98g/mol.
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(iv)Mg(NO3)2
Atomic weight of,
=> Mg=24
=> N = 14
=> O = 16
Molar mass = 1(24)+2(14)+6(16)
=148g/mol.
Therefore,
Molecular mass of Mg(NO3)2 is 148g/mol.
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