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$10 mL$ of a gaseous hydrocarbon is mixed with $70 mL$ of $O X_{2}$ and exploded. After cooling to room temperature the volume is $50 mL$ ; after KOH it is $20 mL$ ; after alkaline pyrogallol it is $0 mL$ . Which statements are correct?

AThe hydrocarbon contains 3 carbon atoms per molecule
BThe hydrocarbon contains 8 hydrogen atoms per molecule
CThe volume of $O X_{2}$ consumed is $50 mL$
DThe hydrocarbon is propane

Answer: A, B, C, D

CO X_{2}

= 50 - 20 = 30

, so

x = 3

(A). Residual

O X_{2}

= 20

(all absorbed by pyrogallol), so

O X_{2}

used

= 50 mL

(C).

10 (3 + y /4) = 50

gives

y = 8

(B).

C X_{3} H X_{8}

is propane (D). All correct.

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