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find number of atoms


crazziekid82
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hello everyone i need help on a question, i have part of it done adn its correct but to get the rest it not working, this is what i have so far

 

Propane is the major LPG constiturnt, assuming that a 17.60g sample is all propane calculate

 

A) number of propane molecules

B) number of carbon atoms

C)number of hydrogen atoms

 

propane= C3H8

 

A) M(c3h8)=44.09gmol-1

n=m/M

= 17.09/44.09

=0.40 moles of propane

 

n=N/6.02x10(23)

N=0.40x 6.02x10(23)

= 2.408x 10(23)

 

B) n©=N/6.02x10(23)

= 12.01x 6.02x10(23)

= 7.23x10(24) .. the answer says 7.22x10(23) which im not sure what i am doing wrong

 

and i can not get the correct answer for hydrogen, final answer is 1.93 x 10(24)

 

please help with the working out.

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