How many moles are in 9.20x10^20 molecules of water (H2O)?
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1.53 * 10^-3 moles of H20

Explanation:

I see that you're using the factor-label method, so if you want to convert a number into another number, let's start with the first number.

We have 9.20 * 10^20 molecules of water.

6.02 * 10^23 particles or molecules of water is 1 mole

If we want moles, we can write it like this

9.20 * 10^20 molecules of H20 | 1 mole of H20                            

                                                    | 6.02 * 10^23 molecules of H20

= 1.53 * 10^-3 moles of H20

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

c. electrical charges of ionic bonds.