Mole ConceptHard
Question
The density of a liquid is 1.2 g/mL. There are 35 drops in 2 mL. The number of molecules in 1 drop is : (molecular weight of liquid = 70)
Options
A.
NA
NAB.
NA
NAC.
NA
NAD.1.2 NA
Solution
Volume of one drop = 
mL
Number of moles in one drop =
Number of molecules is one drop =
× NA
mLNumber of moles in one drop =
Number of molecules is one drop =
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