Question 1
Calculate the molecular masses of $H_{2}, O_{2}, C l_{2}, C O_{2}, C H_{4}, C_{2} H_{6}, C_{2} H_{4}, N H_{3}, C H_{3} O H$ .

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Solution

i) Molecular mass of $H_{2} = 2 \times$ Atomic mass of H
= 2 x 1
= 2 u
ii) Molecular mass of $O_{2} = 2 \times$ Atomic mass of O
$= 2 \times 16$
= 32 u
iii) Molecular mass of $C l_{2} = 2 \times$ Atomic mass of Cl
$= 2 \times 35.5$
= 71 u
iv) Molecular mass of $C O_{2} = Atomic mass of C + 2 \times Atomic mass of O$
$= 12 + 2 \times 16$
= 44 u
v) Molecular mass of CH_4= Atomic mass of $C + 4 \times Atomic mass of H$
$= 12 + 4 \times 1$
= 16 u
vi) Molecular mass of $C_{2} H_{6} = 2 \times Atomic mass of C + 6 \times Atomic mass of H$
$= 2 \times 12 + 6 \times 1$
= 30 u
vii) Molecular mass of $C_{2} H_{4} = 2 \times Atomic mass of C + 4 \times Atomic mass of H$
$= 2 \times 12 + 4 \times 1$
= 28 u
viii) Molecular mass of $N H_{3}$ = Atomic mass of $N + 3 \times Atomic mass of H$
$= 14 + 3 \times 1$
= 17 u
ix) Molecular mass of $C H_{3} O H = Atomic mass of C + 4 \times Atomic mass of H + Atomic mass of O$
$= 12 + 4 \times 1 + 16$
= 32 u

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182

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H_{2}, O_{2}, C l_{2}, C O_{2}, C H_{4}, C_{2} H_{6}, C_{2} H_{4}, N H_{3}, C H_{3} O H

Calculate the molecular masses of $H_{2}, O_{2}, C O_{2}, N H_{3}, C H_{3} O H .$ [5 MARKS]

H_{2}, O_{2}, {CO}_{2}, {NH}_{3} .

The volumes of gases $H_{2}, C H_{4}, C O_{2} a n d N H_{3}$ absorbed by 1 g of charcoal at 288 K are in the order:

M n O_{2} + H C l \to M n C l_{2} + C l_{2} + H_{2} O

N H_{4} C l + C a (O H)_{2} \to N H_{3} + C a C l_{2} + H_{2} O

B a C l_{2} + A l_{2} (S O_{4})_{3} \to B a S O_{4} + A l C l_{3}

N a A l O_{2} + H_{2} O + C O_{2} \to A l H_{3} + N a_{2} C O_{3}

N H_{3} + O_{2} \to N O + H_{2} O

Z n + H N O_{3} \to Z n (N O_{3})_{2} + N O_{2} + H_{2} O

H_{2} S + O_{2} \to H_{2} O + S O_{2}

P b O + C \to P b + C O_{2}

B a C l_{2} + H_{2} S O_{4} \to B a S O_{4} + H C l

C H_{4} + O_{2} \to C O_{2} + H_{2} O

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