Thermodynamics

Thermodynamics

Question

In the reaction,
2Al(s) + 6HCl(aq) → 2Al3+ (aq) + 6Cl¯(aq) + 3H2(g)

  • 6L HCl(aq) is consumed for every 3L H2(g) produced

  • 33.6 L H2(g) is produced regardless of temperature and pressure for every mole Al that reacts

  • 67.2 L H2(g) at STP is produced for every mole Al that reacts

  • 11.2 L H2(g) at STP is produced for every mole HCl (aq) consumed

Answer

D.

11.2 L H2(g) at STP is produced for every mole HCl (aq) consumed

2Al(s) + 6HCl(aq) → 2Al3+ (aq) + 6Cl¯(aq) + 3H2(g)
For each mole of HCl reacted, 0.5 mole of H2 gas is formed at STP.
1 mole of an ideal gas occupies 22.4 lit at STP.
Volume of H2 gas formed at STP per mole of HCl reacted is 22.4 × 0.5 litre

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