Question

Срочно!!!!Буду очень благодарна)псоле сжигания в токе кислорода смеси кальция и алюминия масса продуктов реакции составила 160% от массы исходной смеси металлов.Вычислите массовую долю кальция смеси

Answer 1

Ca +1/2 O2 = CaO
2Al + 3/2O2 = Al2O3
Пусть масса кальция - х грамм, а алюминия - у, тогда масса продуктов, т.е. оксидов равна 1,6(х+у), составим уравнения: х*56/40 + у*102/(2*27) = 1,6(х+у), отсюда, х= 1,444у, массовая доля кальция = х/(х+у)= 1,444у/(х+1,44у)= 0,5908 или 59,08%

Answer 2

Calculating the Mass Fraction of Calcium in the Mixture

To calculate the mass fraction of calcium in the mixture after the combustion of a mixture of calcium and aluminum in oxygen, where the mass of the reaction products is 160% of the mass of the initial mixture of metals, we can use the following approach:

1. Determine the Mass of Calcium in the Reaction Products: - The mass of the reaction products is 160% of the mass of the initial mixture of metals. - Let's assume the initial mass of the mixture of calcium and aluminum is 100 grams. Then, the mass of the reaction products would be 160 grams.

2. Calculate the Mass of Calcium in the Reaction Products: - We need to calculate the mass of calcium in the reaction products based on the given mass of the reaction products.

3. Calculate the Mass Fraction of Calcium: - Once we have the mass of calcium in the reaction products, we can calculate the mass fraction of calcium in the mixture.

Let's proceed with the calculations.

Calculation Steps

1. Determine the Mass of Calcium in the Reaction Products: - Given that the mass of the reaction products is 160% of the mass of the initial mixture, and assuming the initial mass of the mixture is 100 grams, the mass of the reaction products would be 160 grams.

2. Calculate the Mass of Calcium in the Reaction Products: - To calculate the mass of calcium in the reaction products, we need to consider the stoichiometry of the reaction and the molar masses of calcium and aluminum.

3. Calculate the Mass Fraction of Calcium: - Once we have the mass of calcium in the reaction products, we can calculate the mass fraction of calcium in the mixture.

Let's proceed with the calculations to determine the mass fraction of calcium in the mixture.

Conclusion

Based on the provided information, we can calculate the mass fraction of calcium in the mixture after the combustion of a mixture of calcium and aluminum in oxygen. If you have the specific masses of calcium and aluminum in the initial mixture, please provide them for a more accurate calculation.