in an endothermic reaction, the have more energy than the .

A. surroundings, products
B. reactants, products
C. products, reactants
D. reactants, surroundings​

D

Explanation:

in an endothermic reaction the reaction consumes the energy around it

Number of moles = 5.7 moles of oxygen.

Explanation:

We have to convert number of molecules into number of moles by dividing the number of molecules by Avogadro's number.

Here number of molecules of oxygen given is 34.1 × 10²³ molecules.

Now we have to divide the number of molecules by Avogadro's number as,

Number of moles =

                            =

                          = 5.7 moles

So here molecules is converted into moles.