Question

3. Найти количество карбоната калия массой 12,5г.

Answer 1

K2CO3

M(K2CO3)=138

n=m/M=12,5/138=0,09моль

Answer 2

Finding the Amount of Potassium Carbonate with a Mass of 12.5g

To find the amount of potassium carbonate with a mass of 12.5g, we can use the formula:

Amount (in moles) = Mass / Molar mass

The molar mass of potassium carbonate (K2CO3) can be calculated by adding the atomic masses of its constituent elements: potassium (K), carbon (C), and oxygen (O).

The atomic masses are as follows: - Potassium (K): 39.10 g/mol - Carbon (C): 12.01 g/mol - Oxygen (O): 16.00 g/mol

Using this information, we can calculate the molar mass of potassium carbonate and then find the amount of potassium carbonate with a mass of 12.5g.

Molar mass of potassium carbonate (K2CO3): ``` Molar mass = 2*(atomic mass of K) + atomic mass of C + 3*(atomic mass of O) = 2*(39.10) + 12.01 + 3*(16.00) = 78.20 + 12.01 + 48.00 = 138.21 g/mol ```

Amount of potassium carbonate with a mass of 12.5g: ``` Amount = Mass / Molar mass = 12.5g / 138.21 g/mol ≈ 0.0904 moles ```

Therefore, the amount of potassium carbonate with a mass of 12.5g is approximately 0.0904 moles.