Calculate the volume of hydrogen liberated at STP. 500 ml, 0.5M sulphuric acid reacts with excess of zinc. According to equation Zn+H2SO4 -Zn(SO4) +H2

Zn +H2SO4 ZnSO4 +H21 molar 1 L H2SO4 produces 1 mole of hydrogen = 22.4 L0.5 molar 500 ml (0.5L) produces = 22.41 × 1  × 0.5 × 0.5 = 5.6 L of hydrogen at STP. 

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