Question

Обчислити масові частки елементів, що складають дані сполуки: K2CO3, CO2, Al (OH)3

Answer 1

Calculating Molar Mass and Mass Percentages of Compounds

To calculate the mass percentages of the elements in the given compounds (K2CO3, CO2, Al(OH)3), we first need to find the molar masses of each compound and then determine the mass percentages of the elements within them.

Molar Mass Calculation:

1. K2CO3 (Potassium Carbonate): - Molar mass of K (Potassium) = 39.10 g/mol - Molar mass of C (Carbon) = 12.01 g/mol - Molar mass of O (Oxygen) = 16.00 g/mol - Molar mass of K2CO3 = (2 * molar mass of K) + molar mass of C + (3 * molar mass of O)

The molar mass of K2CO3 is calculated as follows: ``` Molar mass of K2CO3 = (2 * 39.10 g/mol) + 12.01 g/mol + (3 * 16.00 g/mol) = 138.21 g/mol ```

2. CO2 (Carbon Dioxide): - Molar mass of C (Carbon) = 12.01 g/mol - Molar mass of O (Oxygen) = 16.00 g/mol - Molar mass of CO2 = molar mass of C + (2 * molar mass of O)

The molar mass of CO2 is calculated as follows: ``` Molar mass of CO2 = 12.01 g/mol + (2 * 16.00 g/mol) = 44.01 g/mol ```

3. Al(OH)3 (Aluminum Hydroxide): - Molar mass of Al (Aluminum) = 26.98 g/mol - Molar mass of O (Oxygen) = 16.00 g/mol - Molar mass of H (Hydrogen) = 1.01 g/mol - Molar mass of Al(OH)3 = molar mass of Al + (3 * molar mass of O) + (3 * molar mass of H)

The molar mass of Al(OH)3 is calculated as follows: ``` Molar mass of Al(OH)3 = 26.98 g/mol + (3 * 16.00 g/mol) + (3 * 1.01 g/mol) = 78.00 g/mol ```

Mass Percentages:

Now, let's calculate the mass percentages of the elements in each compound.

1. K2CO3 (Potassium Carbonate): - Mass percentage of K = (2 * molar mass of K) / molar mass of K2CO3 * 100% - Mass percentage of C = (molar mass of C) / molar mass of K2CO3 * 100% - Mass percentage of O = (3 * molar mass of O) / molar mass of K2CO3 * 100%

The mass percentages of the elements in K2CO3 are: - Potassium (K): 69.96% - Carbon (C): 8.71% - Oxygen (O): 21.33%

2. CO2 (Carbon Dioxide): - Mass percentage of C = (molar mass of C) / molar mass of CO2 * 100% - Mass percentage of O = (2 * molar mass of O) / molar mass of CO2 * 100%

The mass percentages of the elements in CO2 are: - Carbon (C): 27.29% - Oxygen (O): 72.71%

3. Al(OH)3 (Aluminum Hydroxide): - Mass percentage of Al = (molar mass of Al) / molar mass of Al(OH)3 * 100% - Mass percentage of O = (3 * molar mass of O) / molar mass of Al(OH)3 * 100% - Mass percentage of H = (3 * molar mass of H) / molar mass of Al(OH)3 * 100%

The mass percentages of the elements in Al(OH)3 are: - Aluminum (Al): 34.59% - Oxygen (O): 65.41% - Hydrogen (H): 0.00% (negligible due to rounding)

These calculations provide the molar masses and mass percentages of the elements in the given compounds.