Question

Обчислити массові частки елементів у сполуці K2SO3СРОЧНО​

Answer 1

2К=78; S=32; 3О=48
M=78+32+48=158г/моль

Answer 2

ответ: вроде бы правильно

Answer 3

Calculating the Molar Mass of K2SO3

To calculate the mass percent composition of elements in a compound, we first need to find the molar mass of the compound. Let's start by calculating the molar mass of K2SO3.

The molar mass of K (potassium) is approximately 39.10 g/mol, S (sulfur) is approximately 32.07 g/mol, and O (oxygen) is approximately 16.00 g/mol.

The molar mass of K2SO3 can be calculated as follows: ``` Molar mass of K2SO3 = 2 * (molar mass of K) + molar mass of S + 3 * (molar mass of O) = 2 * 39.10 g/mol + 32.07 g/mol + 3 * 16.00 g/mol = 78.20 g/mol + 32.07 g/mol + 48.00 g/mol = 158.27 g/mol ``` The molar mass of K2SO3 is approximately 158.27 g/mol.

Calculating the Mass Percent Composition

Now that we have the molar mass of K2SO3, we can proceed to calculate the mass percent composition of each element in the compound.

1. Potassium (K): - The molar mass of K is 39.10 g/mol. - The number of moles of K in K2SO3 can be calculated using the formula: ``` Moles of K = (Number of moles of K) / (Molar mass of K2SO3) = (2 * 39.10 g/mol) / 158.27 g/mol = 78.20 g/mol / 158.27 g/mol ≈ 0.494 moles ``` - The mass percent of K in K2SO3 can be calculated using the formula: ``` Mass percent of K = (Mass of K in K2SO3) / (Molar mass of K2SO3) * 100% = (0.494 moles * 39.10 g/mol) / 158.27 g/mol * 100% ≈ 15.63% ```

2. Sulfur (S): - The molar mass of S is 32.07 g/mol. - The number of moles of S in K2SO3 is 1. - The mass percent of S in K2SO3 can be calculated using the formula: ``` Mass percent of S = (Molar mass of S) / (Molar mass of K2SO3) * 100% = 32.07 g/mol / 158.27 g/mol * 100% ≈ 20.25% ```

3. Oxygen (O): - The molar mass of O is 16.00 g/mol. - The number of moles of O in K2SO3 can be calculated using the formula: ``` Moles of O = (Number of moles of O) / (Molar mass of K2SO3) = (3 * 16.00 g/mol) / 158.27 g/mol = 48.00 g/mol / 158.27 g/mol ≈ 0.303 moles ``` - The mass percent of O in K2SO3 can be calculated using the formula: ``` Mass percent of O = (Mass of O in K2SO3) / (Molar mass of K2SO3) * 100% = (0.303 moles * 16.00 g/mol) / 158.27 g/mol * 100% ≈ 28.12% ```

In summary, the mass percent composition of elements in K2SO3 is approximately: - Potassium (K): 15.63% - Sulfur (S): 20.25% - Oxygen (O): 28.12%