Question

Рассчитайте массовые доли каждого из элементов в веществе иодид калия

Answer 1

Ответ: Всё в объяснении)

Объяснение: Йодид калия состоит из 1 атома йода и 1 атома калия.

m(K)=M(K); m(I)=M(I) => w(K)=M(K)/M(KI); w(I)=M(I)/M(KI);

w(K)=39/166

w(I)=127/166

Округлённые значения можешь посчитать на микрокалькуляторе :)

Answer 2

Calculation of Mass Fractions in Potassium Iodide

To calculate the mass fractions of each element in potassium iodide (KI), we need to know the molar masses of potassium (K) and iodine (I). The molar mass of potassium is approximately 39.10 grams per mole (g/mol), while the molar mass of iodine is approximately 126.90 g/mol.

The chemical formula for potassium iodide is KI, which indicates that there is one atom of potassium and one atom of iodine in each molecule of potassium iodide.

To calculate the mass fractions, we need to determine the mass of each element in one mole of potassium iodide.

The molar mass of KI is the sum of the molar masses of potassium and iodine:

Molar mass of KI = (1 * molar mass of K) + (1 * molar mass of I)

Molar mass of KI = (1 * 39.10 g/mol) + (1 * 126.90 g/mol)

Molar mass of KI = 166.00 g/mol

Now, we can calculate the mass fraction of each element in potassium iodide.

Mass fraction of potassium (K):

The mass of potassium in one mole of potassium iodide is equal to the molar mass of potassium (39.10 g/mol).

Mass fraction of K = (mass of K) / (molar mass of KI)

Mass fraction of K = 39.10 g / 166.00 g

Mass fraction of K ≈ 0.2353

Mass fraction of iodine (I):

The mass of iodine in one mole of potassium iodide is equal to the molar mass of iodine (126.90 g/mol).

Mass fraction of I = (mass of I) / (molar mass of KI)

Mass fraction of I = 126.90 g / 166.00 g

Mass fraction of I ≈ 0.7647

Therefore, the mass fractions of potassium and iodine in potassium iodide are approximately:

- Potassium (K): 23.53% - Iodine (I): 76.47%

Please note that these values are approximate and may vary slightly depending on the specific isotopic composition of the elements.