Stoichiometry

Question 1

Avegadro’s number

Answer 1

6.02x10^23 = 1 mol

Question 2

Mass of chemical in compound (From g)

Answer 2

Total compound g x atomic mass of chemical / molar mass of compound

Question 3

molar mass of compound

Answer 3

The sum of all atomic masses

Question 4

Empirical formula to Molecular formula

Answer 4

Divide amu by molar mass and multiply each chemical by the quotient

Question 5

Empirical formula from percentages

Answer 5

change percents to grams. Divide each chemical (g) by atomic mass (g) which gives us our mols. Divide each chemical (mol) by smallest quotient (mol). Thats the answer.

Question 6

When finding empirical formula from percentages/grams multiply any .5 mole subscripts by ______, .33/.66 subscripts by ______, .25/.75 subscripts by ______

Answer 6

.5 times 2, .33/.66 times 3, .25/.75 by 4