Advertisements
Advertisements
प्रश्न
LPG stands for liquefied petroleum gas. Varieties of LPG are marketed including a mixture of propane (60%) and butane (40%). If 10 litres of this mixture is burnt, find the total volume of carbon dioxide gas added to the atmosphere. Combustion reaction can be represented as:
\[\ce{C3H8_{(g)} + 5O2_{(g)} -> 3CO2_{(g)} + 4H2O_{(g)}}\]
\[\ce{2C4H10_{(g)} + 13O2_{(g)} -> 8CO2_{(g)} + 10H2O_{(g)}}\]
उत्तर
% of propane = 60%
% of butane = 40%
Total volume of the mixture = 10 litres
Propane = `60/100 xx 10` = 6 litres
Butane = `40/100 xx 10` = 4 litres
(i) Combustion of propane:
| C3H8(g) | + | 5O2(g) | → | 3CO2(g) | + | 4H2O(g) |
| 1 vol. | 3 vol. | |||||
| 6 litres | ? |
1 vol of propane releases 3 vol of CO2
6 litres of propane releases `3/1 xx 6` litres
(ii) Combustion of butane:
| 2C4H10(g) | + | 13O2(g) | → | 8CO2(g) | + | 10H2O(g) |
| 2 vol. | 8 vol. | |||||
| 1 vol. | 4 vol. | |||||
| 4 litres | ? |
2 vol of butane releases 8 vol of CO2
4 litres of butane releases `8/2 xx 4` = 16 litres
Total CO2 released O2 = 18 L + 16 L
= 34 litres of CO2 gas is added to the atmosphere.
APPEARS IN
संबंधित प्रश्न
Give three pieces of information conveyed by the formula H2O.
Under the same conditions of temperature and pressure you collect 2L of carbon dioxide, 3L of chlorine, 5L of hydrogen, 4L of nitrogen and 1L of sulphur dioxide. In which gas sample will there be :
a. The greatest number of molecules.
b. The least number of molecules.
Justify your answer.
O2 is evolved by heating KCIO3 using MnO2 as a catalyst.
\[\ce{2KCI3 ->[MnO2] 2KCl + 3O2}\]
- Calculate the mass of KClO3 required to produce 6.72 litres of O2 at STP. [atomic masses of K = 39, Cl = 35.5, O = 16].
- Calculate the number of moles of oxygen present in the above volume and also the number of molecules.
- Calculate the volume occupied by 0.01 mole of CO2 at STP.
Give two tests of the following:
Water vapour
200 cm3 of hydrogen and 150 cm3 of oxygen are mixed and ignited, as per the following reaction,
\[\ce{2H2 + O2 → 2H2O}\]
What volume of oxygen remains unreacted?
66g of ammonium sulphate is produced by the action of ammonia on sulphuric acid. Write a balanced equation and calculate mass of ammonia required.
Solid ammonium dichromate decomposes as :
\[\ce{(NH4)2Cr2O7 -> N2 + Cr2O3 + 4H2O}\]
If 63 g of ammonium dichromate decomposes. Calculate calculate the mass of chromium (III) oxide formed at the same time.
Washing soda has formula Na2CO3.10H2O. What mass of anhydrous sodium carbonate is left when all the water of crystallization is expelled by heating 57.2 g of washing soda?
66g of ammonium sulphate is produced by the action of ammonia on sulphuric acid. Write a balanced equation and calculate the mass of acid required.
1.56 g of sodium peroxide reacts with water according to the following equation:
\[\ce{2Na2O2 + 2H2O -> 4NaOH + O2}\]
Calculate the mass of oxygen liberated.
