Question

подсчитайте молярные массы окислителя и восстановителя, расставьте коэффициенты KCrO2+H2O2+KOH=K2CrO4+H2O

Answer 1

2KCrO2+3H2O2+2KOH=2K2CrO4+4H2O

 

Молярная масса окислителя(Н2О2)

M(H2O2)=2х1+2х16=34 г/моль

 

Молярная масса восстановителя (KCrO2)

M(KCrO2)=39+52+2х16=123 г/моль 

Answer 2

Calculation of Molar Masses:

To balance the chemical equation and calculate the molar masses of the oxidizing agent (KCrO2) and the reducing agent (H2O2), we need to determine the molar masses of the elements involved.

The molar mass of an element is the mass of one mole of that element and is expressed in grams per mole (g/mol). To calculate the molar mass of a compound, we sum up the molar masses of all the elements present in the compound.

The molar mass of potassium (K) is approximately 39.10 g/mol, the molar mass of chromium (Cr) is approximately 52.00 g/mol, the molar mass of oxygen (O) is approximately 16.00 g/mol, and the molar mass of hydrogen (H) is approximately 1.01 g/mol.

Therefore, the molar mass of KCrO2 can be calculated as follows: - 1 mole of K: 1 * 39.10 g/mol = 39.10 g/mol - 1 mole of Cr: 1 * 52.00 g/mol = 52.00 g/mol - 2 moles of O: 2 * 16.00 g/mol = 32.00 g/mol

Adding these values together, we get: Molar mass of KCrO2 = 39.10 g/mol + 52.00 g/mol + 32.00 g/mol = 123.10 g/mol

The molar mass of water (H2O) can be calculated as follows: - 2 moles of H: 2 * 1.01 g/mol = 2.02 g/mol - 1 mole of O: 1 * 16.00 g/mol = 16.00 g/mol

Adding these values together, we get: Molar mass of H2O = 2.02 g/mol + 16.00 g/mol = 18.02 g/mol

Balancing the Chemical Equation:

Now, let's balance the chemical equation: KCrO2 + H2O2 + KOH = K2CrO4 + H2O

To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation.

1. Balance the atoms other than hydrogen and oxygen: - The equation has one potassium (K) atom on the left side and two potassium (K) atoms on the right side. To balance this, we put a coefficient of 2 in front of KOH on the left side: KCrO2 + H2O2 + 2KOH = K2CrO4 + H2O. - The equation has one chromium (Cr) atom on the left side and one chromium (Cr) atom on the right side. The chromium atom is already balanced. - The equation has two oxygen (O) atoms on the left side and seven oxygen (O) atoms on the right side. To balance this, we put a coefficient of 4 in front of K2CrO4 on the right side: KCrO2 + H2O2 + 2KOH = 4K2CrO4 + H2O.

2. Balance the hydrogen (H) atoms: - The equation has four hydrogen (H) atoms on the left side and two hydrogen (H) atoms on the right side. To balance this, we put a coefficient of 2 in front of H2O on the right side: KCrO2 + H2O2 + 2KOH = 4K2CrO4 + 2H2O.

Now, the chemical equation is balanced as follows: KCrO2 + H2O2 + 2KOH = 4K2CrO4 + 2H2O

Conclusion:

The molar mass of KCrO2 is approximately 123.10 g/mol, and the molar mass of H2O2 is approximately 34.02 g/mol. The balanced chemical equation is: KCrO2 + H2O2 + 2KOH = 4K2CrO4 + 2H2O.

Please note that the molar masses provided are approximate values and may vary slightly depending on the isotopic composition of the elements.