Question

Срочно!10 г чугуна (сплав железа с углеродом) обработали с избытком соляной кислоты. Рассчитайте объем выделенного водорода

Answer 1

Fe+2HCl=FeCL2+H2
n(Fe)=10/56=0,18 моль
n(Fe)=n(H2)
V(H2)=0,18*22,4=4,032 л

Answer 2

Calculating the Volume of Hydrogen Gas Produced

To calculate the volume of hydrogen gas produced when 10g of cast iron (an iron-carbon alloy) is treated with an excess of hydrochloric acid, we can use the stoichiometry of the reaction between iron and hydrochloric acid.

The balanced chemical equation for the reaction between iron and hydrochloric acid is:

Fe + 2HCl → FeCl2 + H2

According to the stoichiometry of the reaction, 1 mole of iron reacts with 2 moles of hydrochloric acid to produce 1 mole of hydrogen gas.

Calculations

1. Calculate the moles of iron in 10g of cast iron: - The molar mass of iron (Fe) is approximately 55.85 g/mol. - Moles of iron = Mass of iron / Molar mass of iron - Moles of iron = 10g / 55.85 g/mol

2. Use the mole ratio from the balanced chemical equation to find the moles of hydrogen gas produced: - Moles of hydrogen gas = Moles of iron * (1 mole of H2 / 1 mole of Fe)

3. Convert moles of hydrogen gas to volume using the ideal gas law: - The ideal gas law is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. - Assuming standard temperature and pressure (STP), where T = 273 K and P = 1 atm, we can use the molar volume of a gas at STP, which is approximately 22.4 L/mol.

Result

By following these calculations, you can determine the volume of hydrogen gas produced when 10g of cast iron is treated with an excess of hydrochloric acid.