Find the volume of hydrogen required to obtain 3.6 g of water. Water is formed according to the scheme: H2 + O2 → H2O
H2 + 1 / 2O2 = H2O.
First, let’s find the mass of hydrogen, from which 3.6 g of water is formed. We know from molar masses that 2 g of hydrogen produces 18 g of water:
2 g – 18 g
x g – 3.6 g.
Hence x = 3.6 * 2/18 = 0.4 g.
Now let’s find the amount of substance hydrogen:
n = m / Mr = 0.4 / 2 = 0.2 mol.
Proceeding from the fact that 1 mole of gas at normal conditions. occupies a volume of 22.4 liters, we determine the volume occupied by 0.2 mol of hydrogen:
V = 0.2 * 22.4 = 4.48 l.
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