Answer
Verified
40.2k+ views
Hint: Combustion is a high temperature exothermic chemical reaction involving a hydrocarbon or organic molecule reacting with oxygen to give carbon dioxide, water and evolution of heat. For example, the combustion of carbon can be expressed as:
${\text{C(s) + }}{{\text{O}}_{\text{2}}}{\text{(g)}} \to {\text{C}}{{\text{O}}_{\text{2}}}{\text{(g)}}$
The change in enthalpy when one mole of a substance undergoes complete combustion is termed as enthalpy of combustion.
Complete step by step answer:
We need to find out the number of oxygen molecules required for the complete combustion of ethane.
By complete combustion, it is meant that the reactants burn in oxygen and gives a limited number of products. The complete combustion of a hydrocarbon or when a hydrocarbon burns in oxygen, carbon dioxide and water are the main products. When elements are burned, the combustion reaction gives their most common oxides as the primary products.
Ethane is a hydrocarbon having the formula ${{\text{C}}_{\text{6}}}{{\text{H}}_{\text{6}}}$ and so its combustion will give carbon dioxide and water. The complete combustion reaction for ethane is : ${\text{2}}{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{6}}}{\text{ + 7}}{{\text{O}}_{\text{2}}} \to {\text{4C}}{{\text{O}}_{\text{2}}}{\text{ + 6}}{{\text{H}}_{\text{2}}}{\text{O + energy}}$
Thus, it can be seen that 7 molecules of oxygen are required for the complete combustion of 2 molecules of ethane. Hence, $\dfrac{7}{2}$ molecules of oxygen are required for the complete combustion of 1 molecule of ethane.
So, the correct answer is D.
Note: In incomplete combustion, there is not enough oxygen for complete reaction to take place to give carbon dioxide and water. In case of incomplete combustion, water is produced just like in complete combustion. But instead of carbon dioxide, carbon, carbon monoxide and hydroxide are produced in incomplete combustion.
${\text{C(s) + }}{{\text{O}}_{\text{2}}}{\text{(g)}} \to {\text{C}}{{\text{O}}_{\text{2}}}{\text{(g)}}$
The change in enthalpy when one mole of a substance undergoes complete combustion is termed as enthalpy of combustion.
Complete step by step answer:
We need to find out the number of oxygen molecules required for the complete combustion of ethane.
By complete combustion, it is meant that the reactants burn in oxygen and gives a limited number of products. The complete combustion of a hydrocarbon or when a hydrocarbon burns in oxygen, carbon dioxide and water are the main products. When elements are burned, the combustion reaction gives their most common oxides as the primary products.
Ethane is a hydrocarbon having the formula ${{\text{C}}_{\text{6}}}{{\text{H}}_{\text{6}}}$ and so its combustion will give carbon dioxide and water. The complete combustion reaction for ethane is : ${\text{2}}{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{6}}}{\text{ + 7}}{{\text{O}}_{\text{2}}} \to {\text{4C}}{{\text{O}}_{\text{2}}}{\text{ + 6}}{{\text{H}}_{\text{2}}}{\text{O + energy}}$
Thus, it can be seen that 7 molecules of oxygen are required for the complete combustion of 2 molecules of ethane. Hence, $\dfrac{7}{2}$ molecules of oxygen are required for the complete combustion of 1 molecule of ethane.
So, the correct answer is D.
Note: In incomplete combustion, there is not enough oxygen for complete reaction to take place to give carbon dioxide and water. In case of incomplete combustion, water is produced just like in complete combustion. But instead of carbon dioxide, carbon, carbon monoxide and hydroxide are produced in incomplete combustion.
Recently Updated Pages
silver wire has diameter 04mm and resistivity 16 times class 12 physics JEE_Main
A parallel plate capacitor has a capacitance C When class 12 physics JEE_Main
A series combination of n1 capacitors each of value class 12 physics JEE_Main
When propyne is treated with aqueous H2SO4 in presence class 12 chemistry JEE_Main
Which of the following is not true in the case of motion class 12 physics JEE_Main
The length of a potentiometer wire is 10m The distance class 12 physics JEE_MAIN
Other Pages
Explain the construction and working of a GeigerMuller class 12 physics JEE_Main
Oxidation state of S in H2S2O8 is A 6 B 7 C +8 D 0 class 12 chemistry JEE_Main
A closed organ pipe and an open organ pipe are tuned class 11 physics JEE_Main
Which of the following is a buffer solution A CH3COOH class 11 chemistry JEE_Main
The mole fraction of the solute in a 1 molal aqueous class 11 chemistry JEE_Main
The resultant of vec A and vec B is perpendicular to class 11 physics JEE_Main