Question #d1a01

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1 Answer
Nam D.
Jan 4, 2018

#6.68*10^22# molecules of water #(H_2O)#

Explanation:

The number of molecules can be calculated by moles.

#"Moles"="Mass of substance"/"Molar mass of substance"#

#:. "Moles"_(H_2O)="2g"/(18.015"g/mol")=0.11101859561477#

#1# mole = #6.02*10^23# atoms, molecules, protons, etc. (Avogadro's constant)

#:. \ "Molecules of" \ H_2O=6.02*10^23 * 0.11101859561477 ~~ 6.68*10^22#

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