Please help!! i am struggling with this. first correct answer gets brainliest!

of unreacted oxygen is left.

Explanation:

To calculate the moles :

According to stoichiometry :

3 moles of  = 5 moles of  

Thus 0.161 moles of =  of

moles of  left unreacted = (0.324-0.268) = 0.056

Volume of left unreacted =

Thus of unreacted oxygen is left.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

the product of the pressure and volume is also constant