Two substances that have the same number of moles of representative particles always have: answer the same number of atoms the same masses the same weights none of the above

the same number of atoms

Explanation:

Mole is defined as amount of substance which contains a fixed number of atoms/molecules/ions/particles and the number is known as Avagadro's number.

One mole is equal to 6.023X10²³ particles of any substance.

For example:

one mole of carbon will have 6.023X10²³ atoms of carbon and one mole of gold will have 6.023X10²³ atoms of gold

Thus the number of atoms will be the same in a given number of moles of any pure element.

Now the mass or weight could not be equal as the mass or weight will depend upon the atomic mass of element.

for example one mole of carbon will weigh 12grams

and one mole of gold will weigh 197grams

put the answers   and i could answer.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.