Question

Обчисліть масові частки елементів в сульфаті натрію (Na2SO4) Будь ласка дуже треба!!!

Answer 1

М(Na2SO4) = (23•2) + 32 + (16•4) = 142

W(Na2) = 46:142 • 100% ≈ 0,32•100% = 32%

W(S) = 32:142•100% = 0,26•100% = 26%

W(O4) = 64:142•100% = 0,45•100% = 45%

Answer 2

Calculating the Molar Mass of Sodium Sulfate (Na2SO4)

Sodium sulfate (Na2SO4) is composed of two sodium (Na) atoms, one sulfur (S) atom, and four oxygen (O) atoms. To calculate the molar mass of sodium sulfate, we need to consider the atomic masses of each element and then sum them up.

The atomic masses of the elements are as follows: - Sodium (Na): 22.99 g/mol - Sulfur (S): 32.07 g/mol - Oxygen (O): 16.00 g/mol

Now, let's calculate the molar mass of sodium sulfate using the given atomic masses:

Molar mass of Na2SO4 = (2 * atomic mass of Na) + atomic mass of S + (4 * atomic mass of O) = (2 * 22.99 g/mol) + 32.07 g/mol + (4 * 16.00 g/mol) = 45.98 g/mol + 32.07 g/mol + 64.00 g/mol = 141.05 g/mol

The molar mass of sodium sulfate (Na2SO4) is 141.05 g/mol.

This calculation is based on the atomic masses of the elements involved in sodium sulfate, as provided by the periodic table and chemical databases.