4.5- Calculating with Chemical Change - Stoichiometry

Question 1

To compare two substances through stoichiometric calculations, you must know what?

Answer 1

Mole ration between them.

Question 2

What is the difference between composition stoichiometry and reaction stoichiometry?

Answer 2

Composition compares moles of compound to moles of one of its elements, reaction compares moles of two substances.

Question 3

In composition stoichiometry, the mole ratio comes from what?

Answer 3

Chemical formula.

Question 4

In reaction stoichiometry, the mole ratio comes from what?

Answer 4

A balanced chemical equation.

Question 5

What is the first thing you need to do in reaction stoichiometry?

Answer 5

Establish a correctly balanced chemical equation.

Question 6

What is the simplest calculation of reaction stoichiometry?

Answer 6

Moles of substance A to moles of substance B.

Question 7

To convert between mass and moles you need to know what?

Answer 7

Mole ratio.

Question 8

What shortcut can gases use at STP when converting from volume to volume?

Answer 8

L gas A = L gas B x (x mole gas A) / (y mole gas B)

Question 9

For gases at same temperature and pressure, their mole ratio is all the same, allowing us to:

Answer 9

substitue one for the other.

Question 10

Molarity expresses what?

Answer 10

Moles of solute per litres of solution.