Unit 0 Part 2

Question 1

mole

Answer 1

unit of measurement of atoms/molecules in realistic sizes

Question 2

Mole is equal to

Answer 2

Avagadro’s number

Question 3

Avagadro’s number

Answer 3

6 x 10^23

Question 4

molar mass

Answer 4

grams in a mole of a substance

Question 5

molar mass is equal to

Answer 5

atomic mass (amu)

Question 6

law of simple proportions

Answer 6

integer ratio of elements in a compound

Question 7

Stoichiometric ratios only apply to __

Answer 7

moles

Question 8

Percent composition

Answer 8

ratio of mass of a substance to total mass of compound

Question 9

Empirical formula

Answer 9

Simplest ratio of atoms in a compound

Question 10

Molecular formula

Answer 10

formula of compound that corresponds with its given mass (multiple of empirical)

Question 11

Percent composition > empirical formula

Answer 11

1. assume percentage is total relative mass (e.g. C 12% = 12g of C)
2. Divide relative mass by molar mass
3. Find simplest ratio of moles

Question 12

Reaction Stoichiometry

Answer 12

proportions of compounds that react

Question 13

Stoichiometric calculation

Answer 13

(in [unit > moles]) x (stoichiometric ratio [unknown element/known element]) x (out [moles > unit])

Question 14

Limiting Reagent

Answer 14

the reactant you deplete first in a reaction

Question 15

How to find limiting reagent

Answer 15

1. find theoretical yields using stoichiometry for a specific product
2. whichever yields the least is limiting

Question 16

Percent yield formula

Answer 16

true yield / max possible yield (found thru limiting reagent)

Question 17

Solvent

Answer 17

Larger amount in a solution (ie water)

Question 18

Solute

Answer 18

Smaller amount in a solution (eg salt)

Question 19

Molarity formula

Answer 19

moles of solute (n) /
volume of solution (L)