Question

Какой объем воздуха и какую массу воды надо взять для превращения сернистого газа объемом 10 л (н.у.) в серную кислоту? Содержание кислорода в воздухе составляет 21%.

Answer 1

1)2SO2 + O2 = 2SO3
2)SO3 + H2O = H2SO4 (домножим на два, чтобы составить общее уравнение)
3)2SO2 + O2 + 2H2O = 2H2SO4
n(SO2) = n(H2O) = V / Vm = 10 / 22,4 = 0,44643 моль
n(O2) = n(SO2) : 2 = 0,44643 : 2 = 0,223215 моль
m(H2O) = M * n = 18 * 0,44643 = 8,0357 г
V(O2) = n * Vm = 0,223215 * 22,4 = 5 л
V(Воздуха) = V(O2) : φ = 5 / 0,21 = 23,81 л
Ответ: Объем воздуха = 23,81 л; Масса воды = 8,0357 г.

Answer 2

Calculating the Volume of Air and Mass of Water Needed

To calculate the volume of air and the mass of water needed to convert 10 liters of sulfur dioxide gas (at standard temperature and pressure) into sulfuric acid, we can use the following steps:

1. Calculate the Volume of Oxygen Needed: - The chemical equation for the conversion of sulfur dioxide to sulfuric acid involves the oxidation of sulfur dioxide by oxygen to form sulfur trioxide, which then reacts with water to form sulfuric acid. - The balanced chemical equation for the reaction is: `SO2 + O2 → SO3` - From the balanced chemical equation, we can see that the molar ratio of SO2 to O2 is 1:1. Therefore, the volume of oxygen needed will be the same as the volume of sulfur dioxide used.

2. Determine the Volume of Air Needed: - Since air is approximately 21% oxygen, we can calculate the volume of air needed to obtain the required volume of oxygen.

3. Calculate the Mass of Water Needed: - Once we have the volume of oxygen, we can calculate the mass of water needed for the subsequent reaction of sulfur trioxide with water to form sulfuric acid.

Calculation Steps

1. Calculate the Volume of Oxygen Needed: