Volumes of Gases.
Hydrogen is produced in the laboratory
by adding zinc to dilute sulfuric acid.
What volume of hydrogen is
by reacting 6·5 g of zinc with dilute sulfuric acid?
1) Find how many moles of zinc are present in 6·5 g of zinc.
RAM of Zn = 65.
moles = mass ÷ RAM
= 6·5 ÷ 65
= 0·1 moles of zinc.
2) Write the equation for the reaction.
sulfuric acid zinc sulfate + hydrogen.
Zn(s) + H2SO4(aq) ZnSO4(aq) + H2(g)
Use the big numbers to find the proportion of reactant to product.
makes 1H2, the proportion is 1 to 1,
so 0·1 moles of zinc will make 0·1 moles of hydrogen.
3) Convert moles into volume.
volume = moles x 24,000 cm3
volume = 0·1 x
= 2,400 cm3 of hydrogen.
So, reacting 6·5 g of zinc with dilute
will produce 2,400 cm3 of hydrogen.
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