Question

Question #a30bd

Answer 1

`1.61 * 10^23` molecules of water.

Explanation:

This is a very simple chemistry question, and the explanation is as followed:

First, you want to calculate the molar mass of water. You can get the necessary information from the atomic weight of each element (see on the periodic table).
H2O = `(2 * 1.01) + 16 = 18.02 g / (mol)`

Now that you have found the molar mass, continue using dimensional analysis to find the answer. Also, note that I use the number `6.022 * 10^23 (atms)/(mol)`. This is Avogadro's number, and it will be very useful in chemistry.

`4.83 g ((1mol)/(18.02g))((6.022*10^23 atms)/(1 mol))`

All you have to do is plug this into your calculator, and you get
`1.61 * 10^23` molecules of water in 4.83 g with three significant figures.