Question

Calculate the no. of water molecules preasent in 5.4 gram of water.​

Answer 1

Explanation:

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Answer 2

5.4 grams H20 * (1 mole H2O / 18 grams H2O) gives the number of moles of water. Call this X. Note that units come out to “moles H2O”.

X moles H2O * (6.02*10^23 molecules H2O / mole H2O) is your answer.

This can be done in one computation:

5.4 grams H20 * (1 mole H2O / 18 grams H2O) * (6.02*10^23 molecules H2O / mole H2O) gives an answer with units “molecules H2O.

The units will help to multiply or divide as needed. It’s a very useful general technical in scientific computations.