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Isomerism

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Question

what volume of hydrogen gas is evolved at 100C and at 0.8 atm pressure when 6.5g of zinc is treated with excess of hydrochloric acid

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Solution

Dear student,

Zn + 2HCl $\overset{}{\to}$ ZnCl₂ + H₂
1mol or
65.4 gm 22.4 L at STP
6.5 gm 2.23 L at STP
( At STP)
P₁V₁ / T₁ = P₂V₂ / T₂
0.8 x V / 373 = 1 x 2.23 / 273
V = 3.8 L
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