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.