Question

Рассчитайте объем количество вещества и массу газа полученного при взаимодействии 10 кальция с водой взятой в избытке

Answer 1

Ca + 2H2O = Ca(OH)2 + H2
n(Ca) =  m/M = 10/40 = 0.25 моль
n(H2) = 0.25 моль
V(H2) = n*Vm = 0.25*22.4 = 5.6 л
m(H2) = n*M = 0.25*2 = 0.5 г

Answer 2

Calculating the Volume, Amount of Substance, and Mass of Gas Produced

When calcium reacts with water in excess, it produces calcium hydroxide and hydrogen gas. The balanced chemical equation for this reaction is:

Ca + 2H2O → Ca(OH)2 + H2

To calculate the volume, amount of substance, and mass of the gas produced, we can use the ideal gas law and stoichiometry.

1. Calculating the Volume of Gas Produced: The volume of gas can be calculated using the ideal gas law equation: V = nRT/P, where: - V = volume of the gas (in liters) - n = amount of substance of the gas (in moles) - R = ideal gas constant (0.0821 L.atm/mol.K) - T = temperature (in Kelvin) - P = pressure (in atmospheres)

2. Calculating the Amount of Substance of Gas Produced: The amount of substance of the gas produced can be determined using the stoichiometry of the reaction. From the balanced chemical equation, we know that 1 mole of calcium produces 1 mole of hydrogen gas.

3. Calculating the Mass of Gas Produced: The mass of the gas produced can be calculated using the formula: mass = n * molar mass, where: - n = amount of substance of the gas (in moles) - molar mass of hydrogen gas = 2 g/mol

Calculation Steps:

1. Calculating the Volume of Gas Produced: - Given that the reaction takes place at standard conditions (1 atm and 273 K), we can use these values for pressure (P) and temperature (T) in the ideal gas law equation.

2. Calculating the Amount of Substance of Gas Produced: - Since 10 moles of calcium are reacting, the amount of substance of hydrogen gas produced will also be 10 moles.

3. Calculating the Mass of Gas Produced: - Using the amount of substance calculated in step 2, we can find the mass of the gas produced.

Results:

1. Volume of Gas Produced: - The volume of hydrogen gas produced can be calculated using the ideal gas law equation.

2. Amount of Substance of Gas Produced: - The amount of substance of hydrogen gas produced is 10 moles.

3. Mass of Gas Produced: - The mass of hydrogen gas produced can be calculated using the amount of substance and the molar mass of hydrogen gas.

Let's proceed with the calculations.