30cm³ of hydrogen was collected over water at 27°C and 780 mm Hg. If the vapour pressure of water at the temperature of the experiment was 10 mm Hg, calculate the volume of the gas at 760 mm Hg and 7°C?

40.0 cm³

35.7 cm³

28.4 cm³

25.2 cm³

Correct answer is C

Y₁ = 30cm³ T₁ = 27 + 273 = 300K and P₁ = (780 - 10)mm Hg i.e the pressure minus the vapour pressure of water
P₂ = 760mm Hg and T₂ = 7 + 273 = 280K
From (P₂V₂) / (T₂) = (P₁V₁) / (T₁)
(770 x 30) / (300) = (760 x O₂) / (280)
V₂ = (770 x 30x 280) / (300 x 760)
V₂ = 28.4 cm³

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30cm3 of hydrogen was collected over water at 27°C and 780 mm Hg. If the vapour pressure of water at the temperature of the experiment was 10 mm Hg, calculate the volume of the gas at 760 mm Hg and 7°C?

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30cm³ of hydrogen was collected over water at 27°C and 780 mm Hg. If the vapour pressure of water at the temperature of the experiment was 10 mm Hg, calculate the volume of the gas at 760 mm Hg and 7°C?