[Aud]

I have this problem:


how many atoms of H are there in a mixture of 3.49x10²³ molecules of H₂O and 78.1 grams of CH₃OH


I dont understand if molecules are bigger than atoms then why do I multiply instead of dividing the number of atoms in h2O to get the amoount of atoms in H2O .

exemple 3.49x10²³ x2 because of 2H in the molecule....


instead of breaking it down

atoms in H20= 3.49x10²³ divided by 3 times 2 ??

 im trying to understand why I think that way and why is it a multiplication

[Borek]

Try to picture it for yourself with smaller numbers and smaller things. Imagine having three (instead of 3.49x10²³) packets, each containing two pencils and one erases. How many pencils do you have?

Now realize that each packet "formula" is (pencil)₂eraser - so it is in a way equivalent to H₂O. Do you see it now?

[Aud]

Try to picture it for yourself with smaller numbers and smaller things. Imagine having three (instead of 3.49x10²³) packets, each containing two pencils and one erases. How many pencils do you have?

Now realize that each packet "formula" is (pencil)₂eraser - so it is in a way equivalent to H₂O. Do you see it now?

thats six, I so understand that concept, thanks a lot. this forum helps me so much since I subed

[mafagafo]

Why don't you go ahead and attempt to solve this problem so we can check your method?