Question

Which reaction is endothermic?
OHCI + NaOH - NaCl + H2O + 58 kJ
| 6CO2 + 12H20 + energy -> CGH12O6 + 602 + 6H20
2Na + Cl2 → 2NaCl + energy
2C2H6 + 702 -> 4CO2 + 6H20 + 2,502 kJ

Answer 1

Answer:

6CO2+12H2O+energy = C6H12O6+6O2+6H2O this reaction is an endothermic reaction.

Explanation:

Endothermic reaction is a specific type of reaction that consume energy in form of heat.In simple words the chemical or biochemical reaction that requires energy from outside is called endothermic reaction.

     6CO2+12H2O+energy  =  C6H12O6+6O2+6H2O

This the only reaction among the 4 reactions mentioned in the question, requires energy.From that point of view it can be stated that the above reaction is an endothermic reaction.

Answer 2

Answer : The correct endothermic reaction is:

$6CO_2+12H_2O+Energy\rightarrow C_6H_{12}O_6+6O_2+6H_2O$

Explanation :

Endothermic reaction : It is a type of chemical reaction in which the energy is absorbed from the surrounding.

Exothermic reaction : It is a type of chemical reaction in which the energy is released into the surrounding.

(a) The given reaction is:

$HCl+NaOH\rightarrow NaCl+H_2O+58kJ$

From the this we conclude that, the energy is released during the reaction. That means, it is an exothermic process.

(b) The given reaction is:

$6CO_2+12H_2O+Energy\rightarrow C_6H_{12}O_6+6O_2+6H_2O$

From the this we conclude that, the energy is absorbed during the reaction. That means, it is an endothermic process.

(c) The given reaction is:

$2Na+Cl_2\rightarrow 2NaCl+Energy$

From the this we conclude that, the energy is released during the reaction. That means, it is an exothermic process.

(d) The given reaction is:

$2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O+2502kJ$

From the this we conclude that, the energy is released during the reaction. That means, it is an exothermic process.

Hence, the correct endothermic reaction is:

$6CO_2+12H_2O+Energy\rightarrow C_6H_{12}O_6+6O_2+6H_2O$