Question 1028603: 1 mole of carbon-12 contains 6.022*10^23 carbon-12 atoms with a mass of 12g.
What is the mass of 1 carbon-12 atom using scientific notation?
What is the mass of carbon-12 atoms in 20.0g of carbon-12?
Calculate the number of moles of carbon-12 atoms in 20.0g of carbon-12
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! i'm not quite sure what you're asking here.
you state that 1 mole of carbon 12 has a mass of 12 grams and contains 6.022 * 10^23 atoms of carbon 12.
this means that 6.022 * 10^23 atoms of carbon 12 has a mass of 12 grams.
you can solve the the mass of one carbon 12 atom by dividing 12 by 6.022 * 10^23.
since 12 is equivalent to 12 * 10^0, you would then divide 12 * 10^0 by 6.022 * 10^23 which will result in 12/6.022 * 10^0/10^23 which will then be equal to 1.992693457 * 10^-23 grams.
that should answer your first question which was:
what is the mass of 1 carbon 12 atom.
the solution is that one carbon 12 atom has a mass of 1.992693457 * 10^-23 grams.
your second question was:
What is the mass of carbon-12 atoms in 20.0g of carbon-12?
the solution to that should be 20 grams.
you might have asked how many atoms of carbon 12 in 20 grams of carbon 12.
that would then be 20/12 * 6.022 * 10^23 = 10.03666667 * 10^23 atoms.
if you multiply that by the mass per gram of carbon 12, you should get 20.
i did and i got 20 grams, as i should have.
your last question asks how many moles are in 20 grams of carbon 12.
if 1 mole weights 12 grams, then take 20 and divide it by 12 and you will get 20/12 = 1.6666666666.... moles, which is equal to 1 and 2/3 moles.
i think this is right.
check it out and get back to me if you don't agree, or if the solutions that you're supposed to get don't agree.
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