Lead(II) sulfide was once used in glazing earthenware. It will also react with hydrogen peroxide to form lead(II) sulfate and water. How many grams of hydrogen peroxide are needed to react completely with 265 g of lead(II) sulfide?

The mass of hydrogen peroxide needed to react completely with given amount of lead (II) sulfide is 122.9 grams.

Explanation:

To calculate the number of moles, we use the equation:

    .....(1)

Given mass of lead(II) sulfide = 265 g

Molar mass of lead(II) sulfide = 293.3 g/mol

Putting values in equation 1, we get:

The chemical equation for the reaction of lead sulfide and hydrogen peroxide follows:

By Stoichiometry of the reaction:

1 mole of lead(II) sulfide reacts with 4 moles of hydrogen peroxide

So, 0.904 moles of lead(II) sulfide will react with = of hydrogen peroxide

Now, calculating the mass of hydrogen peroxide from equation 1, we get:

Molar mass of hydrogen peroxide = 34 g/mol

Moles of hydrogen peroxide = 3.616 moles

Putting values in equation 1, we get:

Hence, the mass of hydrogen peroxide needed to react completely with given amount of lead (II) sulfide is 122.9 grams.

The chemical equation is

Explanation:

There are 2 types of reactions that are classified based on enthalpy change:

Endothermic reactions: They are defined as the reactions where heat is absorbed by the reaction. The change in enthalpy of the reaction is always positive.

Exothermic reactions: They are defined as the reactions where heat is released by the reaction. The change in enthalpy of the reaction is always negative.

Given values:

Energy released for 1 mole of HCl reacted = -42.1 kCal

The chemical equation for the formation of ammonium chloride follows: