How much heat is evolved in converting 1.00 mol of steam at 150.0 ∘C to ice at -45.0 ∘C? The heat capacity of steam is 2.01 J/(g⋅∘C) and of ice is 2.09 J/(g⋅∘C). Express your answer in units of kilojoules. Assume the system is at atmospheric pressure.

Answer : The number of moles of oxygen formed are, 0.255 moles.

Explanation :

The given chemical reaction is:

This reaction is an unbalanced chemical reaction because in this reaction number of oxygen atoms are not balanced.

In order to balance the chemical equation, the coefficient '2' put before the and then we get the balanced chemical equation.

The balanced chemical reaction will be:

Now we have to calculate the number of moles of oxygen formed.

From the balanced chemical reaction we conclude that,

As, 2 moles of hydrogen peroxide react to give 1 mole of oxygen

So, 0.51 moles of hydrogen peroxide react to give mole of oxygen

Therefore, the number of moles of oxygen formed are, 0.255 moles.