Question

Какой объем займёт весь кислород , выделившийся при термическом разложении 1 моль каждого из веществ, формулы которых:KClO3, KMnO4, HgO?

Answer 1

2KClO3=2KCl+3O2
1:2=x:3 x=1.5 моль
2KMnO4=K2MnO4+MnO2+O2
1:2=x:1  x=0.5 моль
2HgO=2Hg+O2
1:2=x:1  x=0.5 моль
n(O2)=2.5 моль
v=22.4*2.5=56 л

Answer 2

Calculating the Volume of Oxygen Released

To calculate the volume of oxygen released from the thermal decomposition of 1 mole of each substance, we can use the molar volume of a gas at standard temperature and pressure (STP), which is 22.4 liters per mole.

- For the thermal decomposition of KClO3: - The balanced chemical equation for the thermal decomposition of KClO3 is: ``` 2 KClO3(s) → 2 KCl(s) + 3 O2(g) ``` - This means that 2 moles of KClO3 produce 3 moles of O2. - Therefore, 1 mole of KClO3 produces 3/2 moles of O2. - Using the molar volume of a gas at STP, the volume of oxygen released from 1 mole of KClO3 is: ``` (3/2) * 22.4 = 33.6 liters ```

- For the thermal decomposition of KMnO4: - The balanced chemical equation for the thermal decomposition of KMnO4 is: ``` 2 KMnO4(s) → K2MnO4(s) + MnO2(s) + 3 O2(g) ``` - This means that 2 moles of KMnO4 produce 3 moles of O2. - Therefore, 1 mole of KMnO4 produces 3/2 moles of O2. - Using the molar volume of a gas at STP, the volume of oxygen released from 1 mole of KMnO4 is: ``` (3/2) * 22.4 = 33.6 liters ```

- For the thermal decomposition of HgO: - The balanced chemical equation for the thermal decomposition of HgO is: ``` 2 HgO(s) → 2 Hg(l) + O2(g) ``` - This means that 2 moles of HgO produce 1 mole of O2. - Therefore, 1 mole of HgO produces 1/2 moles of O2. - Using the molar volume of a gas at STP, the volume of oxygen released from 1 mole of HgO is: ``` (1/2) * 22.4 = 11.2 liters ```

In summary: - The volume of oxygen released from the thermal decomposition of 1 mole of KClO3 is approximately 33.6 liters. - The volume of oxygen released from the thermal decomposition of 1 mole of KMnO4 is approximately 33.6 liters. - The volume of oxygen released from the thermal decomposition of 1 mole of HgO is approximately 11.2 liters.