Question

Convert 1.2x10^21 formula units of magnesium hydroxide to grams

Answer 1

We need to convert 1.2x10^21 formula units of magnesium hydroxide to grams

First, we must use that

Using that, we can calculate the number of moles of magnesium hydroxide

`1.2\cdot10^(21)(1mol)/(6.022\cdot10^(23))=1.99\cdot10^(-3)mol`

Then, using that the molar mass of magnesium hydroxide is 58 g/mol we can calculate the grams

`1.99\cdot10^(-3)mol\cdot58(g)/(mol)=0.115g`

Finally, 1.2x10^21 formula units of magnesium hydroxide are 0.115 grams

ANSWER:

0.115