4. How many water molecules are there in 45g of water?

The answer is 18.01528. We assume you are converting between grams H2O and mole. You can view more details on each measurement unit: molecular weight of H2O or mol This compound is also known as Water or Dihydrogen Monoxide.

Explanation:

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the correct answer to this question is 2

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.