Please help !!! :(( How many grams are in 5.40 x 10^24 molecules of H₂O?

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Correct me if wrong but its 162g of H₂O

Explanation:

I only did H₂O because you can apply this process for the rest but

First we need to find the molar mass of H₂O from the periodic table by adding said elements atomic masses together.  1.01(2) + 16.00=18.02g/mol We can use this 18.02g/mol as a conversion from moles to grams. Since there are molecules we need to use Avagadros number 6.02x10^23. This number can be used for molecules, particles and atoms and can convert from molecules, particles and atoms to moles. Now we use dimensional analysis so our units cancelyour answer will be 161.6 but the least significant figures is 3 so round to 162  SO in general you need to calculate the molar mass of said species  so you can convert to your desired units, hope this helped!!

Thermohaline circulation and gyres