Question

Calculate the molar mass of ch4 , Co2 and H20 by formula.
please give me step by step answer ​

Answer 1

Answer:

Molecular mass: Sum of atomic mass of atom in a molecule.

Molecular mass of CH4 = 16

In CH4, mass of carbon = 12

mass of hydrogen = 1, which is four times

So, 12 + (1*4) = 16

Similarly, in CO2 = 44

mass of carbon = 12

mass of oxygen = 16

CO2 => 12 +(16*2) = 44

and in H2O = 18

mass of hydrogen = 1

mass of oxygen = 16

H2O => (1*2) + 16 = 18

Hope it helps :)

Answer 2

(i) Molar mass of water (H²O)

=2×atomic mass of hydrogen +atomic mass of oxygen

Molar mass of water=2(1g/mol)+16g/mol=18g/mol

(ii) Molar mas of CO²

=atomic mass of carbon+2×atomic mass of oxygen

Molar mass of CO²

=12g/mol+2(16g/mol)=44g/mol

(iii) Molar mass of methane =atomic mass of carbon+4×atomic mass of hydrogen

Molar mass of methane=12g/mol+4(1g/mol)=16g/mol