Question

calculate the molar mass of the following. (1) H2O (2)co2(3)ch4​

Answer 1

Explanation:

Calculate the molecular mass of the following : (i) H2O; (ii) CO2; (iii) CH4 Ans. (i) Molecular mass of H2O = 2 (1.008 amu) + 16.00 amu = 18.016 amu. (ii) Molecular mass of CO2 = 12.01 amu + 2 ×16.00 amu = 44.01 amu. (iii) Molecular mass of CH4 = 12.01 amu + 4 (l.

Answer 2

Answer :

we need to calculate the molar mass of the following :

(i) H2O

• Atomic mass of hydrogen = 1
• Atomic mass of oxygen = 16

Molar mass of H2O :

= 1 × 2 + 16

= 2 + 16

= 18 amu

(ii)Co2

• Atomic mass of carbon = 12
• Atomic mass of oxygen = 16

Molar mass of Co2 :

= 12 + 16 × 2

= 12 + 32

= 44 amu

(iii) CH4

• Atomic mass of carbon = 12
• Atomic mass of hydrogen = 1

Molar mass of CH4 :

= 12 + 1 × 4

= 12 + 4

= 16 amu

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