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6.5 g of zinc (molar mass 65 g/mol) is added to excess dilute…
Question
6.5 g of zinc (molar mass 65 g/mol) is added to excess dilute hydrochloric acid: Zn + 2HCl -> ZnCl2 + H2. Calculate the volume (in litres) of hydrogen gas evolved, measured at STP, taking the molar volume of a gas at STP as 22.4 L/mol.
✓ Verified answer: 2.24checked by our engine — not a guess
Step-by-step solution
Moles Zn = 6.5/65 = 0.100.
From Zn + 2HCl -> ZnCl2 + H2, 1 mol Zn gives 1 mol H2, so moles H2 = 0.100.
Volume at STP = 0.100 x 22.4 = 2.24 L.
Final answer2.24
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