Which statement best describes a mole?
it is 12 units of a given substance.
it contains 6.02 mc001-1.jpg 1023 grams of sodium chloride.
it is the mass of 12 carbon atoms.
it contains 6.02 mc001-2.jpg 1023 particles of a given substance.

Answer : The correct option is, It contains particles of a given substance.

Explanation :

According to the mole concept, one mole of a substance contains number of particles of a given substance.

For example :

1 mole of oxygen (O) contains number of oxygen atoms

1 mole of oxygen contains number of oxygen atoms

Hence, the correct option is, It contains particles of a given substance.

answer; i believe that the correct answer is (c) explore the outer planets; / plz check good luck

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.