Chemistry

balancing equations

100

____N₂ + ____H₂ --> ___NH₃

____N₂ + _3_H₂ --> _2_ NH₃

200

__NaCl + __F₂ --> __ NaF + __Cl₂

_2_NaCl + __F₂ --> _2_ NaF + __Cl₂

300

__ CH₄ + __O₂ --> __CO₂ + __H₂O

__ CH₄ + _2_O₂ --> __CO₂ + _2_H₂O

400

__C₈H₁₈ + __O₂ --> __CO₂ + __ H₂O

_2_C₈H₁₈ + _25_O₂ --> _16_CO₂ + _18_ H₂O

500

__FeCl₃ + __ NaOH --> __Fe(OH)₃ + __NaCl

__FeCl₃ + _3_ NaOH --> __Fe(OH)₃ + _3_NaCl

600

__P + __ O₂ --> __P₂O₅

_4_P + _5_ O₂ --> _2_P₂O₅

700

__S₈ + __ O₂ --> __ SO₃

__S₈ + _12_ O₂ --> _8_ SO₃

800

__ K + __ MgBr₂ --> __KBr + __Mg

_2_ K + __ MgBr₂ --> _2_KBr + __Mg

moles

100

what are the 3 representative particles

atoms

molecules 

formula unit

200

how many representative particles in 1 mole

6.022 x 10²³ 

300

how many liters in 1 mole

22.4

400

how many grams are in 1 mol of Carbon?

12.01 g

500

how many moles of carbon dioxide are in 50 grams of carbon dioxide (CO₂)

1.14 mol CO₂

600

what is the mass of one atom of iron (Fe)

9 x 10^-23 g Fe

700

calculate the number of moles in 39.7 L of bromine (Br₂)

1.77 mol Br₂

800

How many representative particles are in 8.1 L of nitrogen gas (N₂)

2.2 x 10 ²³ rep. N₂

Molar Mass

100

Sodium Chloride (NaCl)

58.44 g/mol

200

Carbon Dioxide (CO₂)

44.01 g/mol

300

Aluminum Oxide (Al₂O₃)

101.96 g/mol 

400

Glucose (C₆H₁₂O₆)

180.18 g/mol

500

Polonium (Po)

208.98 g/mol

600

Oxygen Gas (O₂)

32.00 g/mol 

700

Propanol (C₃H₇OH)

60.11 g/mol

800

Ammonium Sulfate ((NH₄)₂SO₄)

132.17 g/mol 

Percent Composition

100

Magnesium Oxide (MgO)

39.7 = O 

60.3 = Mg 

200

Calcium carbonate (CaCO₃)

40 = Ca

12 = C

48 = O₃

300

Ammonia (NH₃)

N = 82.2 

H₃ = 17.8 

400

Iron (III) Oxide (Fe₂O₃)

Fe ₂ = 69.9 

O ₃ = 30.1

500

How does molar mass affect percent composition ? 

It determines the proportions of the percentage taken up by each element. 

600

Fill in the blank: 

Percent of element= (mass of element in a compound / ______________) x 100

Percent of element= (mass of element in a compound / molar mass of compound) x 100

700

water (H₂O)

H = 11.1 

O = 88.9

800

Glucose (C₆H₁₂O₆)

C = 40 

H = 6.7  

O = 53.3

Molecular & Empirical Formulas

100

a compound is 40% carbon, 6.7% hydrogen and 34% oxygen. Find the empirical formula

CH₂O

200

a compound is 52.2% carbon, 13.0% hydrogen, and 34.8% oxygen. Find the empirical formula

C₂H₆O

300

empirical formula: CH

Molar Mass: 78.0 g/mol

find the molecular formula

C₆H₆

400

a compound is 82.8% carbon and 17.2% hydrogen with a molar mass of 58.0 g/mol. Determine the molecular formula 

C₄H₈

500

a compound is made up of 69.9% iron and 30.1% oxygen. Find the empirical formula

Fe₂O₃

600

What is the difference between the two?

the molecular formula is a multiple of the empirical formula 

700

A compound contains 24.3% magnesium and 75.7% chlorine. Determine the empirical formula

MgCl₂

800

The empirical formula of a compound is C₂H₅ and its molar mass is 60.0 g/mol. determine the molecular formula

C₄H₁₀