Question

Рассчитайте молярные массы следующих веществ: а) хлор, б) оксид железа (III), в) вода, г) гидрид азота, д) сульфид фосфора!

Answer 1

Объяснение:

M(Cl2) = 71 г/моль;

M(Fe2O3) = 160 г/моль;

M(H2O) = 18 г/моль;

M(NH3) = 17 г/моль;

M(P2S3) = 158 г/моль.

Answer 2

Calculation of Molar Masses

To calculate the molar masses of the given substances, we need to determine the atomic masses of the elements present in each compound. Here are the molar masses of the substances you provided:

a) Chlorine (Cl): - The atomic mass of chlorine is approximately 35.45 grams per mole. - Therefore, the molar mass of chlorine is approximately 35.45 g/mol.

b) Iron (III) oxide (Fe2O3): - The atomic mass of iron (Fe) is approximately 55.85 grams per mole. - The atomic mass of oxygen (O) is approximately 16.00 grams per mole. - Since there are two iron atoms and three oxygen atoms in one molecule of iron (III) oxide, we can calculate the molar mass as follows: - Molar mass of iron (III) oxide = (2 * atomic mass of iron) + (3 * atomic mass of oxygen) - Molar mass of iron (III) oxide = (2 * 55.85 g/mol) + (3 * 16.00 g/mol) - Molar mass of iron (III) oxide is approximately 159.70 g/mol.

c) Water (H2O): - The atomic mass of hydrogen (H) is approximately 1.01 grams per mole. - The atomic mass of oxygen (O) is approximately 16.00 grams per mole. - Since there are two hydrogen atoms and one oxygen atom in one molecule of water, we can calculate the molar mass as follows: - Molar mass of water = (2 * atomic mass of hydrogen) + atomic mass of oxygen - Molar mass of water = (2 * 1.01 g/mol) + 16.00 g/mol - Molar mass of water is approximately 18.02 g/mol.

d) Nitrogen hydride (NH3): - The atomic mass of nitrogen (N) is approximately 14.01 grams per mole. - The atomic mass of hydrogen (H) is approximately 1.01 grams per mole. - Since there is one nitrogen atom and three hydrogen atoms in one molecule of nitrogen hydride, we can calculate the molar mass as follows: - Molar mass of nitrogen hydride = atomic mass of nitrogen + (3 * atomic mass of hydrogen) - Molar mass of nitrogen hydride = 14.01 g/mol + (3 * 1.01 g/mol) - Molar mass of nitrogen hydride is approximately 17.03 g/mol.

e) Phosphorus sulfide (P2S5): - The atomic mass of phosphorus (P) is approximately 30.97 grams per mole. - The atomic mass of sulfur (S) is approximately 32.07 grams per mole. - Since there are two phosphorus atoms and five sulfur atoms in one molecule of phosphorus sulfide, we can calculate the molar mass as follows: - Molar mass of phosphorus sulfide = (2 * atomic mass of phosphorus) + (5 * atomic mass of sulfur) - Molar mass of phosphorus sulfide = (2 * 30.97 g/mol) + (5 * 32.07 g/mol) - Molar mass of phosphorus sulfide is approximately 222.25 g/mol.

Please note that the molar masses provided are approximate values based on the atomic masses of the elements mentioned.