Question

Обчисліть масові частки всіх елементів у таких сполуках NO2, PbCl2.

Answer 1

NO2=46 а.о.м
N=14=14:46=0.30435= 0.30435• 100= 30.435 а.о.м
O2=32=32:46=0.69565•100=69.565
PbCl2=176 а.о.м
Pb=106=106:176=0.60227•100=60.227
Cl2=70=70:176=0.39773•100=39.773
удачи со списованием

Answer 2

Mass fractions of elements in NO2:

To calculate the mass fractions of elements in a compound, we need to know the molar mass of each element and the molar mass of the compound.

The molar mass of nitrogen (N) is approximately 14.01 g/mol, and the molar mass of oxygen (O) is approximately 16.00 g/mol.

The molar mass of NO2 can be calculated by adding the molar masses of nitrogen and two oxygen atoms: Molar mass of NO2 = (1 * molar mass of N) + (2 * molar mass of O) = (1 * 14.01 g/mol) + (2 * 16.00 g/mol) = 46.01 g/mol.

To calculate the mass fraction of nitrogen in NO2, we divide the molar mass of nitrogen by the molar mass of NO2 and multiply by 100: Mass fraction of nitrogen = (molar mass of N / molar mass of NO2) * 100 = (14.01 g/mol / 46.01 g/mol) * 100 ≈ 30.43%.

To calculate the mass fraction of oxygen in NO2, we divide the molar mass of oxygen by the molar mass of NO2 and multiply by 100: Mass fraction of oxygen = (2 * molar mass of O / molar mass of NO2) * 100 = (2 * 16.00 g/mol / 46.01 g/mol) * 100 ≈ 69.57%.

Therefore, the mass fractions of elements in NO2 are approximately: - Nitrogen (N): 30.43% - Oxygen (O): 69.57%.

Mass fractions of elements in PbCl2:

To calculate the mass fractions of elements in PbCl2, we need to know the molar mass of each element and the molar mass of the compound.

The molar mass of lead (Pb) is approximately 207.2 g/mol, and the molar mass of chlorine (Cl) is approximately 35.45 g/mol.

The molar mass of PbCl2 can be calculated by adding the molar masses of lead and two chlorine atoms: Molar mass of PbCl2 = (1 * molar mass of Pb) + (2 * molar mass of Cl) = (1 * 207.2 g/mol) + (2 * 35.45 g/mol) = 278.1 g/mol.

To calculate the mass fraction of lead in PbCl2, we divide the molar mass of lead by the molar mass of PbCl2 and multiply by 100: Mass fraction of lead = (molar mass of Pb / molar mass of PbCl2) * 100 = (207.2 g/mol / 278.1 g/mol) * 100 ≈ 74.47%.

To calculate the mass fraction of chlorine in PbCl2, we divide the molar mass of chlorine by the molar mass of PbCl2 and multiply by 100: Mass fraction of chlorine = (2 * molar mass of Cl / molar mass of PbCl2) * 100 = (2 * 35.45 g/mol / 278.1 g/mol) * 100 ≈ 25.53%.

Therefore, the mass fractions of elements in PbCl2 are approximately: - Lead (Pb): 74.47% - Chlorine (Cl): 25.53%.

Please note that these calculations are approximate and may vary slightly depending on the exact molar masses used.