Unit 8 Chemical Formulas

Empirical Formulas

100

2.20 g of Sulfur (S) and 7.81 g of Fluorine (F)

SF₆

200

6.35 g AG

0.825 g of N

2.83 g of O

AgNO₃

300

C₁₆H₁₆N₄

CHN

400

43.6% P

56.4% O

PO₂

500

Ai 22.1%

P 25.4%

O 52.5%

AiPO₄

Molecular Formulas

100

Caffeine is made of 49.48% of C , 5.19% H , 16.48% O , 28.8% N. Find the molecular formula of caffeine if it’s overall molecular mass is 194.22 g/mol

C₈H₁₀O₂N₄

200

Benzene and Acetylene have the same empirical formula, CH. Benzene has an experimental molar mass of 78g. Acetylene has an experimental molar mass of 26g. What are the molecular formulas of benzene and acetylene?

Benzene: C₇₂H₆

Acetylene: C₂₄H₂

300

Mevalonic Acid contains 48.64% C , 8.16% H , 43.20% O. If mevalonic acid has an experimental molar mass of 148g what is its molecular formula?

C₆H₁₂O₄

400

Vanilla Acid contains 57.14 % C, 4.80 % H and 38.06% O, has an experimental molar mass of 168g. What is the molecular forumla of vanillic acid?

C₈H₈O₄

500

Nicotine contains 74.0% C , 8.70% H , 17.3% N. If the experimental molar mass is 162g, what is nicotines molecular formula?

C₁₀H₁₄N₂

Naming Compounds

100

Name this compound: CaCi₂

Calcium Trichloride

200

MgO

Magnesium monoxide (For bonus state the vowel rule)

300

(NH₄)₂SO4

Ammonium Sulfate

400

PCi₅

Phosphorus Pentachloride

500

Ca₉C₆

nonacalcium heptachloride

Mass Percent composition

100

Ca(OH)₂

Ca 54%

O 43%

H 2%

200

C₄H₈O₄

C 40%

H 6.733%

O 53.3%

300

(NH₄)₃PO₄

N 28.37%

H 8.18%

P 20.27%

O 43.24%

400

C₁₇H₁₉NO₃

C 71.57%
H 6.6%

N 4.9%

O 16%

500

Na₂Cr₂O₇

Na 17%

Cr 40%

O 42.7%

More naming

100

CaCO₃

Calcium Cobalt (III)

200

FeSO₄

Iron monosulfide tetreoxide

300

FeCi₃

Iron Trichloride

400

CuC₂H₃O₂

Copper Dicarbon triatomic dioxide

500

PCi5

Phosphorus trichloride