How many liters of hydrogen are formed when 4.6 g of sodium reacts with water?
April 27, 2021 | education
| 1.Let’s find the amount of sodium substance by the formula:
n = m: M.
M (Na) = 23 g / mol.
n = 4.6 g: 23 g / mol = 0.2 mol.
2. Let’s compose the reaction equation, find the quantitative ratios of substances.
2Na + 2H2O = 2NaOH + H2.
According to the reaction equation, there is 1 mole of hydrogen per 2 mol of sodium. Substances are in quantitative ratios of 2: 1.
The amount of hydrogen will be 2 times less than sodium.
2 mol Na – 1 mol H2,
0.2 mol Na – х mol H2
x mol H2 = (0.2 × 1): 2 = 0.1 mol.
3.Let’s find the volume of hydrogen.
V = Vn n, where Vn is the molar volume of gas, equal to 22.4 l / mol, and n is the amount of substance.
V = 0.1 mol × 22.4 L / mol = 2.24 L.
Answer: 2.24 liters.
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