What is the mass of a moles of Mg(OH)2​

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Mg(OH)2, or 58.31968 grams.

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.

gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.