UNIT 2B Lesson 4-8

Question 1

What is a mole?

Answer 1

Avogadro’s number: 6.02x1023 atoms/molecules

Question 2

What is the molar mass of an individual atom? and how do you find it?

Answer 2

It is the mass of one mole of that element or compound (g/mol). You find it by look at the elements atomic mass on the periodic table.

Question 3

What is the formula for molar mass?

Answer 3

‘mom made minh nutella’
m=mass=g
mm=molar mass=g/mol
n=number of moles=mol

Question 4

What is molarity? (molar concentration)

Answer 4

The number of moles of solute in a given volume of solution. (mol/L)

Question 5

what is the formula for molarity?

Answer 5

‘no More Vegans’
n=number of moles=mol
M=molarity=mol/L
V=volume=L

Question 6

Sometimes you need to use ….

Answer 6

BOTH TRIANGLES and work them together

Question 7

Dont forget to use …. and show…

Answer 7

SIG FIGS and UNITS

Question 8

What is stoiciometry?

Answer 8

It is a method of solving problems that does not require formulas, as long as all the units cancel out other than the answer one.

Question 9

How do you express the values in stoiciometry?

Answer 9

in fractions!!!! (ratios)

Question 10

How do you get started for stoiciometry?

Answer 10

write down the unit you are looking for wth a question mark (?g=)

Question 11

What do you need to make sure to do in stoiciometry?

Answer 11

flip flop the fractions (aka pick the same unit numerator as the last fractions denominator)

Question 12

how many things should you use in stoiciometry?

Answer 12

2 different elements/molecules

Question 13

When does your formula for stoiciometry end?

Answer 13

when you’ve used the second unit in the question.