Question

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

For the first question, the coefficients in the reaction give you the mol ratio. 2 mol K = 1 mol Cu

Answer 2

Do you know how to do conversions?

Answer 3

yes

Answer 4

Can you use this equality to convert from mol Cu to mol K?

Answer 5

not sure what that is, no

Answer 6

4.15 mol Cu * (2 mol K)/(1 mol Cu) = 8.3 mol K

Answer 7

okay

Answer 8

Do you see how I canceled the mol Cu and left mol K?

Answer 9

This is assuming the reaction goes to completion. A reasonable assumption for stoich problems.

Answer 10

yes, that makes sense

Answer 11

could you walk me through the second question by chance?

Answer 12

@JoannaBlackwelder

Answer 13

Sorry, tech difficulties.

Answer 14

The second one actually has 3 steps. so it is quite a bit more difficult.

Answer 15

You will need to know Avogadro's number and the molar mass of copper (II) sulfate.

Answer 16

1 mole = 6.022 x 10^23 atoms

Answer 17

Can you find the molar mass of CuSO4?