How many moles of gold are there in 4.54 x 10^22 atoms of gold

0.075moles

Explanation:

1 gold gives 6.022×10^23atoms

X gold gives 4.54×10^22 atoms

Cross multiply

6.022×10^x=4.54×10^22

Divide both sides by 6.022×10^23

X=0.075 moles

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.