How many atoms of carbon are in #"0.0235 g"# of cocaine hydrochloride, #"C"_17"H"_22"ClNO"_4#?
2 Answers
Explanation:
First find the moles of carbon:
Then multiply the moles by avogadro's constant to tell you the number of carbon atoms in the sample.
There are
Explanation:
The molecular formula for cocaine hydrochloride,
In order to determine the mol
The molar mass of
https://www.ncbi.nlm.nih.gov/pccompound?term=%22COCAINE+HYDROCHLORIDE%22
Divide its given mass by its molar mass by multiplying by its inverse.
#0.0235color(red)cancel(color(black)("g C"_17"H"_22"ClNO"_4))xx(1"mol C"_17"H"_22"ClNO"_4)/(339.816color(red)cancel(color(black)("g C"_17"H"_22"ClNO"_4)))="0.00006916 mol C"_17"H"_22"ClNO"_4#
Multiply mol
#0.000069161color(red)cancel(color(black)("mol C"_17"H"_22"ClNO"_4))xx(17"mol C")/(1color(red)cancel(color(black)("mol C"_17"H"_22"ClNO"_4)))="0.00117572 mol C"#
#0.00117572color(red)cancel(color(black)("mol C"))xx(6.022xx10^23"atoms C")/(1color(red)cancel(color(black)("mol C")))#
#= 7.08xx10^20"atoms C"# , rounded to three significant figures