3 A student has a 5.00 gram sample of calcium chloride (CaCl2) solid. How many moles of calcium chloride are

contained in this sample?

0.0450 moles of

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number of particles.

To calculate the moles, we use the equation:

Thus there are 0.0450 moles of

not clear

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.