How many atoms of Hydrogen (H) are in 3.82 grams of C2H6O?

Question

thomaster · Answer

divide the mass by the molar mass of C2H6O (46.07 g/mol)
then multiply with Avogadro's number (6.0221413*10^23)

anonymous · Answer

I did 3.82 grams divided by 46.08 grams and multiplied it by Avogadro's number and get  4.99E22

anonymous · Answer

I have to type in my homework answers to a website that grades them and it will not accept my answer.

thomaster · Answer

ow wait

anonymous · Answer

How do I find the number of H atoms and not just the molecules?

thomaster · Answer

sorry I didn't read the question correctly... it only asks for hydrogen atoms.

we first divide 3.82 by 46.08 to get the amount of moles C2H6O. That is 0.08289
Now multiply that by 6 to get the amount of moles H. that's 0.4974 mol
Now multiply by avogadro's number to get the answer.

thomaster · Answer

Apologies for the misunderstanding :)

anonymous · Answer

2.99e23 got it, thank you so much

thomaster · Answer

No problem :)

anonymous · Answer

Do you know how to find empirical formulas from compounds?

thomaster · Answer

I do but I really got to go now :( check this website or ask it in a new question, I'm sure someone else can help you. http://www.chem.tamu.edu/class/majors/tutorialnotefiles/empirical.htm