Question

How many atoms are present in 0.0845 moles of tungsten (W)?

5.09 x 1022
1.40 x 10-25
1.40 x 1021
5.09 x 10-24

Answer 1

So to do questions like these, you can use the triangle of equations which will help you convert moles into no. of molecules. The triangle looks like this:

All you have to do, is if you wanted to find the no. of atoms/molecules (they mean the same thing) in an element, you cover that up with your finger, and then you do what the triangle tells you to do. So if you cover it up, as you can see you're left with Avogadro's number (which is the constant no. of molecules in 1 mol of any substance) and also no. of moles. They are both on the bottom of the triangle. The line dividing them is multiply, meaning to find the no. of molecules of an element you will have to do: moles x Avogadro's number

Doing this, you will come out with your answer which will be the amount of atoms in your substance. Once you have your answer, you will correctly be able to choose which answer on your multiple choice question is correct.

I hope this helps! Feel free to ask any questions :)