To 100 g of a solution of hydrochloric acid with a mass fraction of 20% is added a solution of sodium

| September 5, 2021 | education

To 100 g of a solution of hydrochloric acid with a mass fraction of 20% is added a solution of sodium carbonate with a mass of 50 g with a mass fraction of 40% find the mass of the resulting gas

1. We write down the equation of the proceeding reaction:

2HCl + Na2CO3 = 2NaCl + H2O + CO2 ↑;

2.Calculate the mass of the acid:

m (HCl) = w (HCl) * m (solution) = 0.2 * 100 = 20 g;

3. find the chemical amount of hydrogen chloride:

n (HCl) = m (HCl): M (HCl) = 20: 36.5 = 0.5479 mol;

4.Calculate the mass of sodium carbonate:

m (Na2CO3) = w (Na2CO3) * m (solution) = 0.4 * 50 = 20 g;

5.determine the amount of carbonate:

n (Na2CO3) = m (Na2CO3): M (Na2CO3);

M (Na2CO3) = 2 * 23 + 12 + 3 * 16 = 106 g / mol;

n (Na2CO3) = 20: 106 = 0.1887 mol;

6.the lack of sodium carbonate is taken, we find the amount of carbon dioxide:

n (CO2) = n (Na2CO3) = 0.1887 mol;

7.Calculate the mass of gas:

m (CO2) = n (CO2) * M (CO2);

M (CO2) = 12 + 32 = 44 g / mol;

m (CO2) = 0.1887 * 44 = 8.3 g.

Answer: 8.3 g.



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