Unit 9 Test

Conversions

100

How many particles are in 1 mole?

6.022 *10^23 particles

200

How many formula units are in 3 moles of Oxygen?

1.81 *10^24 formula units

300

How many moles are in 100 grams of Water?

5.55 moles

400

How many formula units are in 62.7 grams of Vanadium?

7.41 *10^23 formula units

500

How many grams are in 13.94 *10^23 formula units of Calcium Oxalate?

296.53 grams of CaC2O4.

Molar Mass

100

What is the molar mass of Gold?

197.0 g/mol

200

What is the molar mass of Fluorine?

38.0 g/mol

300

What is the molar mass of Sodium Hydroxide? 

40 g/mol

400

What is the molar mass of Rubidium Acetate?

144.52 g/mol

500

What is the molar mass of Ammonium Thiosulfate?

148.24 g/mol

% Composition

100

What is the % composition (to 2 decimal places) of the Oxygen in one molecule of Water?

88.79%

200

What is the percent compostiton (to 2 decimal places) of each element in one molecule of NaCl?

Na: 39.34%

Cl: 60.66%

300

What is the percent compostiton (to 2 decimal places) of each element in one molecule of Carbon Dioxide?

C:27.29%

O:72.71%

400

What is the percent compositon (to 2 decimal places) of every element in one molecule of Copper (I) Hydrogen Carbonate?

Cu:51.02%

H: 0.81%

C: 9.64%

O: 38.53%

500

What is the percent composition (to 2 decimal places) of every element in one molecule of Hydronium Nitrite?

H:4.66%

O:73.80%

N:21.54%

Formulas

100

A compound weighing 119 g consists of 19.65% Potassium and 67.14% Bromine by mass. What is the empirical formula?

K2Br7

200

What is the Molecular formula for a compound that contains 19.65 grams of Potassium and 67.14 grams of Bromine. The molar mass of the compound is 238 grams per mole?

K4Br14

300

:Empirical Formula : Whole # X: Molecular Formula:

CH3O                    : X5            : _____________:

C5H15O5

400

Empirical Formula: Whole # X: Molecular Formula

Magnesium Nitride:     X2      : __________

Mg6N4

500

Empirical Formula: Whole # X: Molecular Formula

Silver Sulfate       : X3            :_______________ 

Ag6S3O12

Hydrates

100

What is the written name for the following hydrate, CuSO4 X 5H2O?

Copper (II) Sulfate Pentahydrate.

200

How much mass is water in Calcium Chloride x Dihydrate when the hydrate compound weighs 4.72 grams and the anhydrate weighs 3.56 grams?

1.18g

300

Name the hydrate: NaOH * 2 H2O

Sodium Hydroxide Dihydrate.

400

Name the Hydrate: RbClO * 9 H20

Rubidium Hypochlorite Nonahydrate.

500

What is the mass of the anhydrate when the hydrate weighs 4.89 grams and the water weighs 1.02 grams?

3.87 g