How many liters of hydrogen measured under normal conditions can be obtained by the action of 13 g of zinc on hydrochloric acid?
The reaction of zinc with sulfuric acid is described by the following formula:
Zn + 2HCl = ZnCl2 + H2
That is, the molar amounts of zinc used and hydrogen produced are equal.
Let’s calculate the molar amount of zinc.
The molar mass of zinc is 65 grams / mol.
13 grams of zinc is 13 grams / 65 grams / mol = 0.2 mol of the substance.
The same number of moles of hydrogen will be obtained
1 mole of ideal gas under normal conditions takes a volume equal to 22.4 liters
0.2 mol of hydrogen will take up a volume of 22.4 liters / mol * 0.2 mol = 4.48 liters.
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