Find the molecular masses of the following compounds.
Sulphuric Acid $(H_{2} S O_{4})$ ,
Potassium Nitrate $(K N O_{3})$
Hydrogen Sulphide $(H_{2} S)$
Carbon Dioxide $(C O_{2})$
(Atomic Masses : H = 1, S = 32, C = 12, O = 16, K = 40, N = 14)

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Solution

Molecular masses can be written as:
(i) $H_{2} S O_{4}$ ; $2 \times 1 + 32 + 16 \times 4$ = 98
(ii) $K N O_{3}$ ; $40 + 14 + 16 \times 3$ = 102
(iii) $H_{2} S$ ; $2 \times 1 + 32$ = 34
(iv) $C O_{2}$ ; $12 + 16 \times 2$ = 44

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Q. Calculate the molecular masses of the following compounds :
(a) Hydrogen sulphide, H₂S
(b) Carbon disulphide, CS₂

(Atomic masses : H = 1 u ; S = 32 u ; C = 12 u)

Q. Calculate the molecular masses of the following :
(a) Hydrogen, H₂
(b) Oxygen, O₂
(c) Chlorine, Cl₂
(d) Ammonia, NH₃
(e) Carbon dioxide, CO₂

(Atomic masses : H = 1 u ; O = 16 u ; Cl = 35.5 u ; N = 14 u ; C = 12 u)

Q. Calculate the molecular mass of the following:

(N H_{4})_{2} C O_{3}

Given: atomic mass of

N a = 23, H = 1, O = 16, C = 12, N = 14, M g = 24, S = 32

Calculate the relative molecular masses of (Use K = 39, Cl = 35.5, O = 16, C = 12, H = 1, Na = 23, N = 14, S = 32)
(a) potassium chlorate
(b) sodium acetate
(c) chloroform
(d) ammonium sulphate

(a) Define atomic mass unit.

(b) Calculate the molecular mass of the following :

(i) $C u S O_{4} .5 H_{2} O$ (ii) $(N H_{4})_{2} C O_{3}$

(iii) $(N H_{2})_{2} C O$ (iv) $M g_{3} N_{2}$

Given atomic mass of Cu = 63.5, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32

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Find the molecular masses of the following compounds.Sulphuric Acid (H2SO4),Potassium Nitrate (KNO3)Hydrogen Sulphide (H2S)Carbon Dioxide (CO2)(Atomic Masses : H = 1, S = 32, C = 12, O = 16, K = 40, N = 14)

Molecular masses can be written as:(i) H2SO4 ; 2×1+32+16×4 = 98(ii) KNO3; 40+14+16×3 = 102(iii) H2S; 2×1+32 = 34(iv) CO2; 12+16×2 = 44

Find the molecular masses of the following compounds.
Sulphuric Acid $(H_{2} S O_{4})$ ,
Potassium Nitrate $(K N O_{3})$
Hydrogen Sulphide $(H_{2} S)$
Carbon Dioxide $(C O_{2})$
(Atomic Masses : H = 1, S = 32, C = 12, O = 16, K = 40, N = 14)

Molecular masses can be written as:
(i) $H_{2} S O_{4}$ ; $2 \times 1 + 32 + 16 \times 4$ = 98
(ii) $K N O_{3}$ ; $40 + 14 + 16 \times 3$ = 102
(iii) $H_{2} S$ ; $2 \times 1 + 32$ = 34
(iv) $C O_{2}$ ; $12 + 16 \times 2$ = 44