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Mole Concept and Avogadro's Number

What mass of ...

Question

What mass of Oxygen is combined with $9.02 g$ of Sulphur in

(a) Sulphur dioxide, $S O_{2}$ and
(b) Sulphur trioxide, $S O_{3}$

23.5 g O

S O_{2}

and

19.02 g O

S O_{3}

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19.02 g O

S O_{2}

and

23.5 g O

S O_{3}

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9.02 g O

S O_{2}

and

13.5 g O

S O_{3}

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9.02 g O

S O_{3}

and

13.5 g O

S O_{2}

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Solution

The correct option is C $9.02 g O$ in $S O_{2}$ and $13.5 g O$ in $S O_{3}$
we have
$S + O_{2} \to S O_{2}$
moles of S = $\frac{9.02}{32} = 0.281$
moles of oxygen require = 0.281
so mass of oxygen require = 0.28132 = 8.99g

$S + 3 / 2 O_{2} \to S O_{3}$
moles of oxygen require = $\frac{3}{2} 0.281 = 0.4215$
mass of oxygen require = 0.215*32 = 13.5g

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