Question

Calculate the molar mass of he following :
(i) H2O
(ii) CO2
(iii) CH4
Ncert solutions for Class 11th Chemistry Part - 1 Chapter 1 Exercise 1

Answer 1

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Answer 2

Given : Atomic mass of Hydrogen, H = 1gm

            Atomic mass of carbon, C  = 12gm

            Atomic mass of oxygen, O = 16gm

To Find: Molar mass of H₂O= M₁

              Molar mass of CO₂= M₂

             Molar mass of CH₄ = M₃

Solution:

               To calculate molar mass formula used -

Molar mass = molecular mass/ number of moles= g/mol

Molar mass of H₂O (M₁) :

M₁ = Molecular mass of H₂O(m₁) / number of moles of H₂O(n₁)

Here, m₁ = 1+1+16 = 18g and n₁ = 1 mol

M₁ = 18/1

   = 18 g/mol

Molar mass of CO₂ (M₂):

M₂ = Molecular mass of CO₂( m₂) / number of moles of CO₂(n₂)

Here, m₂ = 12+16+16 = g, and n₂= 1 mol

M₂ = 44 /1

    = 44g/mol

Molar mass of CH₄(M₃):

M₃ = Molecular mass of CH₄( m₃) / number of moles of CH₄ (n₃)

Here, m₃ = 12+1+1+1+1 = 16g, and n₃ = 1 mol

M₃ = 16 /1

    = 16g/mol

Hence, M₁ = 18 g/mol

            M₂ = 44 g/mol

            M₃ = 16 g/mol