Compounds and Stoichiometry

Question 1

What is Avogadro’s Number?

Answer 1

6.022 x 10^23

Question 2

what is molar mass?

Answer 2

mass of one mole of a compound (g/mol)

Question 3

what is gram equivalent weight?

Answer 3

the amount of a compound (g) that produces one equivalent of the particle of interest

Question 4

what is normality? What is meant by 1 N solution of acid?

Answer 4

measure of concentration (equivalents/L) 1N acid solution = solution with 1 mole of H+ ions per liter

Question 5

How to find empirical formula from percent compositions? Molecular formula?

Answer 5

1. assume 100g sample 2. find moles of each element in 100g sample 3. moles of element / smallest number of moles for molecular formula 4. molecular formula mass / empirical formula mass

Question 6

How to find molecular formula from percent composition and molar mass?

Answer 6

for each element, 1. (molar mass X decimal percent composition) / atomic weight

Question 7

nitrite

Answer 7

NO₂^-

Question 8

nitrate

Answer 8

NO₃^-

Question 9

sulfite

Answer 9

SO₃^2-

Question 10

sulfate

Answer 10

SO₄^2-

Question 11

hypochlorite

Answer 11

ClO^-

Question 12

chlorite

Answer 12

ClO₂^-

Question 13

chlorate

Answer 13

ClO₃^-

Question 14

perchlorate

Answer 14

ClO₄^-

Question 15

hydrogen carbonate (bicarbonate)

Answer 15

HCO₃^-

Question 16

hydrogen sulfate

Answer 16

HSO₄^-

Question 17

dihydrogen phosphate

Answer 17

H₂PO₄^-

Question 18

permanganate

Answer 18

MnO₄^-

Question 19

acetate

Answer 19

C₂H₃O₂^-

Question 20

cyanide

Answer 20

CN^-