Question

Помогите пожалуйста: После полного сжигания в избытке Ca и Al масса продуктов составила 160 процентов от массы исходных веществ.Найдите массовую долю Ca в смеси.

Answer 1

2Ca+O2=2CaO
4Al+3O2=2Al2O3
112/80*m*w=1,4*m*w грамм окиси.
204/108*m*(1-w)=1,889*m*(1-w) грамм окиси.
1,4*m*w+1,889*m*(1-w)=1,4*m*w+1.889*m-1,889*m*w=1,889*m-0,449*m*w грамм.
(1,889*m-0,449*m*w)/m=1,6
0,449*w=0,229
w=0,51 или 51%
Ответ: Массовая доля кальция в исходной смеси составляет 51%

Answer 2

Calculation of the Mass Fraction of Ca in the Mixture

To find the mass fraction of Ca in the mixture, we need to calculate the mass of Ca in the products and the mass of the entire mixture.

Given: - The mass of the products after complete combustion of Ca and Al in excess is 160% of the mass of the initial substances.

To calculate the mass fraction of Ca, we can use the following formula:

Mass Fraction of Ca = (Mass of Ca in the Products) / (Mass of the Entire Mixture)

Let's calculate the mass of Ca in the products and the mass of the entire mixture.

1. Mass