Question

can someone explain stoichiometry to me please?

Answer 1

what exactly about it?

Answer 2

I don't understand anything about it. :(

Answer 3

okay, well, in chemical reactions, everything is dealt with in terms of moles.

do you know what a mole is?

Answer 4

kind of.... but not really.

Answer 5

a mole is just a number, an amount.

just like a dozen means 12, a mole means 6.023x10^23

so if you have a dozen of doughnuts, you have 12 doughnuts
and if you have a mole of doughnuts, you have 6.023x10^23 doughnuts

Answer 6

okay that makes sense and that's a lot of doughnuts haha!

Answer 7

lol well it's just to illustrate

so if you have a reaction

A -> 2B

1 mole of A will give you 2 moles of B

I wanna point out that you have to convert to moles ALWAYS (except maybe with ideal gases) because moles are not proportional to mass.

for example, 1 mole of hydrogen is 1 g/mol and 1 mole of He is 4 g/mol

Answer 8

you lost me haha!

Answer 9

lol okay.. so you have chemical equation for combustion:

C2H4 + 3O2 -> 2CO2 + 2H2O

i already balanced it, (do you know how to balance them?)

lets say i tell you how much ethene (C2H4) did i burn if i made 30 L of CO2 gas?

how would you do it?

Answer 10

im confused about what you're asking

Answer 11

given the equation above, if you produced 30 L of CO2 gas, how much C2H4 did you burn?

Answer 12

well i'd suggest you watch some vids,

http://www.youtube.com/watch?v=FSyAehMdpyI&list=PL8dPuuaLjXtPHzzYuWy6fYEaX9mQQ8oGr

and look up chemistry one's on khan academy

Answer 13

By far I used fractions to solve these
http://www.kentchemistry.com/moviesfiles/chemguy/advanced/ChemguyStoich.htm

Answer 14

thank you both :)