How many atoms of aluminum are in 2.75 mol of aluminum?

Explanation:

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In this case, by using the Avogadro's number one can compute the required amount of aluminium atoms as shown below considering that one mole of aluminium equals 6.022x10²³ atoms of aluminum:

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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.