Tag: chemistry

Carbon monoxide is produced by incomplete combustion of fuels.
The complete combustion of fuels will give carbon dioxide.
$\displaystyle C + \dfrac {1}{2}O _2 \rightarrow CO$
$\displaystyle C +  O _2 \rightarrow CO _2$

LPG is liquefied petroleum gas which is a compound of butane and propane. It is used as cooking fuel (in heating appliances, cooking equipment), motor fuel (in vehicles) and refrigeration.

The reaction $\displaystyle C _3H _8 + 5O _2\rightarrow  3CO _2 + H _2O$ is an example of combustion reaction. Propane on complete combustion in  presence of excess oxygen gives carbon dioxide and water.

LPG has a lower energy density than either petrol or fuel-oil, so the equivalent fuel-consumption is higher.
Lower energy density means lesser amount of energy is released during combustion of unit mass of fuel. Hence, to obtain certain quantity of fuel more fuel should be combusted.

LPG can be used as a power source for combined heat and power technologies (CHP).
Combined  heat and power (CHP) is the simultaneous generation of electricity and useful heating from the combustion of a fuel. It is a thermodynamically efficient use of fuel.

Statement 1 : When a hydrocaron is combusted in air, $CO _2$ is the major product whereas the $CO$ is produced if there is incomplete combustion of some hydrocarbon.
Statement 2: Air contains much more nitrogen than air.
$N _2= 78$%
$O _2 = 21$%

Acetylene is used in-
Illumination of cycle lamps, hawker's lamps and buoys in light houses.
Producing oxyacetylene flame for welding and cutting.