In the world of chemistry, a 'mole' is a number of something... a very large number of something. Just as a 'dozen' is 12 of something, a 'mole' is about 6.02 * 1023 of something.

In chemistry, we like to measure the number of atoms or molecules in moles.

If one mole is equal to 6.02 * 1023 atoms, and you have 8.00 * 1023 atoms, then how many moles do you have?

Round your answer to two decimal places.

where are the choice options?

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.

you need to have a picture of the atom that way we can answer it

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l