Grade 10Physical Chemistry
How to calculate the mass of one molecule of water (H2O)?
How to calculate the mass of one molecule of water (H2O)?
1 Answer
ADITI SINGH
What is the mass of one molecule of H2O?
Step #1 - the molar mass of water is 18.015 g/mol. This was calculated by multiplying the atomic weight of hydrogen (1.008) by two and adding the result to the weight for one oxygen (15.999).
Please remember that you need the molar mass first when trying to find the mass of one molecule.
Step #2 - divide the substance's molar mass by Avogadro's Number.
18.015 grams/mol ÷ 6.022 x 1023 mol¯1 = 2.992 x 10¯23 grams
Note that the final answer has been rounded to four significant figures (from 2.9915 - note use of rounding with five rule) and that the unit of mole cancels.
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