Chapter 4: Compounds and Stiochiometry

Question 1

Combination reaction

Answer 1

A + B → C

Question 2

Decomposition reaction

Answer 2

A → B + C

Question 3

Combustion reaction

Answer 3

oxidation (using O2 or similar) of a fuel (typically hydrocarbon

Question 4

1 mole of any ideal gas at STP

Answer 4

22.4 L

Question 5

1 mole of any substance

Answer 5

6.022 x 10^23 particles (Avogadro’s number)

Question 6

1 mole of any substance

Answer 6

its molar mass in grams (from the periodic table)

Question 7

Moles from mass

Answer 7

Moles = mass of a sample / molar mass

Question 8

Gram equivalent weight

Answer 8

GEW= molar mass/ n

n = the number of particles of interest

Question 9

Equivalents from mass

Answer 9

Equivalents = mass of compound / gram equivalent weight

Question 10

Molarity from normality

Answer 10

Molarity = normality / n

n = the number of particles of interest

Question 11

Percent Composition

Answer 11

% composition = [mass of elements in formula / molar mass ] x 100%

Question 12

Percent yield

Answer 12

% yield = [actual yield / theoretical yield] x 100%