Chemistry: Chapter 10

Question 1

what is Avogadro’s number?

Answer 1

6.02 x 10^23 representative particles (atoms, formula units, or molecules)

Question 2

what are atoms?

Answer 2

singular elements

Question 3

what are formula units?

Answer 3

ionic compounds

Question 4

what are molecules?

Answer 4

covalent compounds

Question 5

how to convert moles to the number of atoms?

Answer 5

6.02x10^23 moles (of the compound/element) to the number of the compound / element atoms (ex. CO2 = 3 atoms)

Question 6

how to find molar mass

Answer 6

find the amu in each element and add them up

Question 7

what is the measurement of molar volume?

Answer 7

22.4 Liters

Question 8

what to use to find the mass?

Answer 8

molar mass

Question 9

what to use to find the number of particles?

Answer 9

Avogadro’s number

Question 10

what to use to find the volume of a gas at STP?

Answer 10

22.4 liters

Question 11

how to find % composition? (3)

Answer 11

1. find the molar mass of the individual elements
2. find total molar mass of the compound
3. divide the element’s molar mass by the total mass

Question 12

how to find the empirical formula? (3)

Answer 12

*percent of the element = number of grams of the element

1. given grams (%) of element x (1mole of element / amu of the element)
2. use the lowest number of moles and divide that by each of the elements’ moles
3. apply the ratio to the formula

Question 13

how to find molecular formula?

Answer 13

given determined molar mass / empirical formula mass

the result of that equation is what you use to multiply the empirical formula’s subscripts by