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3 years ago

A sample of C3H8 has 6.96 × 1024 H atoms. How many carbon atoms does the sample contain?

1 answer:

4 0

A sample has 3.28 X 10^24 h atoms

so first we will find the moles of Hydrogen by putting values in formula
that is
. moles = no. of atoms/ Avogadro's no (NA) moles
= 5.446 we got this
 now the ratio of Carbon and Hydrogen is: C = H 
 3 = 8 
now multiply it with the moles
3/8 * 5.466 = 5.466 2.05 is the moles of C
. now:find the no of C atoms by this
 = moles X NA 
= 2.05 X 6.022 X 10^23
= 1.27 X10^2
now will find the mass of sampl:
so One mole of C3H8 = 3 moles of C 1/3 * 2.05 = 2.05 moles of C
 0.68 moles of C3H8. 
now the mass of C3H8 = moles X molar mass mass of C3H8
which is = 0.68 X 44 =
 30.2 grams of C3H8

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