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How many grams are in 5.40 x 10^24 molecules of H₂O?

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kamron259757

Answer:

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 cancel
  • your 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!!
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