The volume of hydrogen gas evolved at STP when 0.9g of Al is dissolved in excess of dilute H2SO4
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To calculate the volume of hydrogen gas evolved,
- Mass of Aluminium = 0.9g
- Equivalent weight of Al = 27/3 = 9g
- No. of equivalent of Al dissolved = 0.9/9 = 0.1eq
- No. of equivalent of H2 evolved = 0.1eq
- Mass of H2 evolved = 0.1 ×1 = 0.1 [1 is the equivalent weight of H2]
- No. of moles of H2 evolved = 0.1/2 = 1/20 moles
- Molar volume at STP = 22.4L
- Volume of H2 evolved = 22.4 × 1/20 = 1.12L
Hence, 1.12L of H2 gas is evolved.
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