18. Liquid benzene (C6H6)burns in oxygen according to 2C6H6(I)+15O2---->12CO2 (g)+6H2O (g) How many litres of O2 at STP are needed to complete of 39g of liquid benzene?

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Solution

${2 C}_{6} H_{6} + 15 O_{2} ⟶ 12 {C O}_{2} + {6 H}_{2} O$
$2 m o l e s o f C_{6} H_{6} r e a c t s w i t h 15 m o l e s o f o x y g e n$
$(2 \times 27 g m o f b e n z e n e) r e q u i r e s = (15 \times 22.4 L o f o x y g e n) a t S T P$
$56 g m C_{6} H_{6} ⟶ 336 L o f O_{2}$
$1 g r a m C_{6} H_{6} ⟶ \frac{336}{156} L o f O_{2}$
$39 g r a m o f C_{6} H_{6} ⟶ \frac{336}{156} \times 39 L o f O_{2}$
$= 84 L o f O_{2} a t S T P$

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2 C_{6} H_{6} + 15 O_{2} \to 12 C O_{2} + 6 H_{2} O

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