Question

Знайдіть коефіцієнти методом електронного балансу: Mg+H2SO4(конц.)=MgSO4 + H2S + H2O

Answer 1

4Mg+5H2SO4(конц.)=4MgSO4 + H2S +4H2O

Answer 2

Finding Coefficients Using the Electron Balance Method

To find the coefficients for the chemical equation Mg + H2SO4 → MgSO4 + H2S + H2O using the electron balance method, we need to balance the atoms and charges on both sides of the equation.

First, let's break down the equation into its constituent elements and ions:

1. Mg: Magnesium 2. H2SO4: Sulfuric acid 3. MgSO4: Magnesium sulfate 4. H2S: Hydrogen sulfide 5. H2O: Water

Balancing the Equation

The unbalanced equation is: Mg + H2SO4 → MgSO4 + H2S + H2O

We'll start by balancing the atoms in the equation, then balance the charges.

Balancing the Atoms

1. Mg: There is 1 Mg on the left side and 1 Mg on the right side. 2. Sulfur (S): There is 1 S in H2SO4 and 1 S in MgSO4, so S is balanced. 3. Hydrogen (H): There are 2 H in H2SO4 and 2 H in H2S, so H is balanced. 4. Oxygen (O): There are 4 O in H2SO4 and 4 O in MgSO4, but 1 O in H2O, so O is not balanced.

Balancing the Oxygen Atoms

To balance the oxygen atoms, we can add a coefficient to H2O. Let's start by adding a coefficient of 4 to H2O on the right side of the equation:

Mg + H2SO4 → MgSO4 + H2S + 4H2O

Now, the oxygen atoms are balanced: - 4 O in H2O on the right side - 4 O in MgSO4 on the right side - 4 O in H2SO4 on the left side

Balancing the Hydrogen Atoms

Now, let's balance the hydrogen atoms. There are 8 H in 4H2O on the right side, so we need to add a coefficient of 4 to H2SO4 on the left side:

Mg + 4H2SO4 → MgSO4 + H2S + 4H2O

Balancing the Charges

The charges are automatically balanced in this case because all the compounds are neutral.

Conclusion

The balanced chemical equation with coefficients is: Mg + 4H2SO4 → MgSO4 + H2S + 4H2O

This equation satisfies the law of conservation of mass and charge.