Question

ПОЖАЛУЙСТА!!!ПЛИИЗ. ПОМОГИТЕ Сколько литров газа (н.у.) выделится при взаимодействии 6.4 г меди с раствором массой 25 г, содержащим 90% серной кислоты . Мr (H2SO4)=98 Mr (Cu)=64

Answer 1

Cu + 2H2SO4 (конц. ) = CuSO4 + SO2 + 2H2O
n(Cu)=0.1моль
n(so2)=n(Cu)=0.1моль
V=nVm
V(so2)=0.1*22.4=2.24 л

Answer 2

Calculation of Gas Volume Produced

To calculate the volume of gas (at standard temperature and pressure) produced when 6.4 g of copper reacts with a solution weighing 25 g and containing 90% sulfuric acid, we can use the stoichiometry of the reaction and the ideal gas law.

The balanced chemical equation for the reaction between copper and sulfuric acid is:

2 H2SO4 + Cu → CuSO4 + SO2 + 2 H2O

First, we need to determine the limiting reagent in the reaction. Then, we can use the stoichiometry of the reaction to find the amount of gas produced. Finally, we can use the ideal gas law to convert the amount of gas to volume.

Limiting Reagent Calculation

The molar mass of sulfuric acid (H2SO4) is 98 g/mol, and the molar mass of copper (Cu) is 64 g/mol.

The number of moles of copper is given by: Number of moles = Mass / Molar mass Number of moles of Cu = 6.4 g / 64 g/mol = 0.1 mol

The number of moles of sulfuric acid is given by: Number of moles = (Mass * Percentage purity) / Molar mass Number of moles of H2SO4 = (25 g * 0.90) / 98 g/mol = 0.228 moles

The balanced chemical equation shows that 1 mole of copper reacts with 2 moles of sulfuric acid. Therefore, the limiting reagent is copper, as it will be completely consumed when 0.1 moles of it react with 0.2 moles of sulfuric acid.

Calculation of Gas Produced

According to the balanced chemical equation, 1 mole of copper reacts to produce 1 mole of sulfur dioxide gas (SO2).

The volume of gas produced can be calculated using the ideal gas law: PV = nRT

Where: P = pressure (at standard conditions, P = 1 atm) V = volume n = number of moles R = ideal gas constant (0.0821 L·atm/(K·mol)) T = temperature (at standard conditions, T = 273 K)

The volume of gas produced can be calculated using the number of moles of sulfur dioxide and the ideal gas law.

Conclusion

The volume of gas produced when 6.4 g of copper reacts with a solution weighing 25 g and containing 90% sulfuric acid can be calculated using the stoichiometry of the reaction and the ideal gas law.