Question

I hate to put questions on the wrong division, but I have a quiz tomorrow and no one has answered this in the chemistry department for a few hours.

Stoichiometry

1 CuSO4 + 2 K --> 1 K2SO4 + 1 Cu

How many moles of potassium are required to produce 4.15 moles of copper?

How many grams of copper (II) sulfate are needed to react with 4.0 x 10^24 atoms of potassium?

Answer 1

ok, the potassium to copper ratio is 2:1 in terms of moles.
so 2:1=x:4.15

Answer 2

does my reasoning (or lack there of) make sense?

Answer 3

I guess I'm just confused as to how the ratio is determined.

Answer 4

the ratio of moles in a chemical equation is always constant. Moles have nothing to do directly with masses, but a mole is a quantity in units of an item. If you have a mole of potassium, you have 6.02*10^23 atoms of potassium. If you have a mole of K2SO4, than you have 6.02*10^23 units of K2SO4. Because chemicals react in units, you can use the ratio of a chemical equation to determine the amount of moles of one molecule/ionic bonding if you know the amount of moles of another.

Answer 5

alright

Answer 6

how much of that made any sense?

Answer 7

all of it minus the last sentance

Answer 8

to produce 1 mole of Cu moles of K needed =2
To produce 4.15 moles of Cu moles of K needed=2*4.15=8.30

Answer 9

that makes sense surjithayer

Answer 10

ok, so lets say you burn 1 mole of hydrogen gas. when you burn hydrogen gas you get water (since hydrogen plus oxygen=water). To figure out how much of it though you need the BALANCED chemical equation. I'll give it to you down here.

2H2+O2=2H2O

in other words if you burn 2 moles (1.204*10^24 molecules) of hydrogen gas you need half the amount of moles, 1 mole (6.02*10^23 molecules) of oxygen gas. You will get 2 moles (1.204*10^24 molecules) of water.

Answer 11

does that make sense?

Answer 12

a bit

Answer 13

what doesn't make sense?

Answer 14

how you need half the amount of moles

Answer 15

let me start over.
so let's say you have the reaction
2H2+O2=2H2O
if I have 2 dozen hydrogen gas molecules than I need 1 dozen oxygen gas molecules to make 2 dozen water molecules. does that make sense?

Answer 16

yes

Answer 17

now, replace "dozen" with moles. A mole is the same kind of thing as a dozen, just a dozen refers to 12, while a mole refers to avogrado's number, 6.02*10^23

Answer 18

okay