Arrange the following in order of increasing mass? 16 water molecules 2 atoms of lead 0.0000000000000051 moles of helium

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Al E. Share
Feb 8, 2018

A clever unit conversion problem!

Consider,

#16"molecules" * ("mol")/(6.02*10^23"molecules") * (18g)/"mol" approx 4.8*10^-22g#

of water,

#2"atoms" * ("mol")/(6.02*10^23"atoms") * (207.2g)/"mol" approx 6.8*10^-22g#

of lead, and (this is why we use scientific notation, sheesh!),

#5.1*10^-15"mol" * (2g)/"mol" approx 1.0*10^-14g#

of helium.

Hence,

#"He" > "Pb" > H_2O# in terms of mass.

This proves just how many molecules are in a mole. Thank God, they don't sell eggs in that quantity.

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