Ch 3: Stoichiometry: Ratios of Combination

Question 1

What cancer drug has this chemical formula:
Pt(NH₃)₂Cl₂

Answer 1

cisplatin

Question 2

Define molecular mass.

Answer 2

The mass in atomic mass units (amu) of an individual molecule.

p. 84

Question 3

Because the atomic masses on the periodic table are average atomic masses, the result of such a determination is an average molecular mass, sometimes referred to as the _________ _______.

Answer 3

molecular weight

p. 84

Question 4

A mole is defined as the amount of a substance that contains as many elementary entities (atoms/molecules/formula units, etc) as there are atoms in….

Answer 4

…..exactly 12 g of carbon-12.

(0. 012 kg)
p. 93

Question 5

The number of entities in a mole is known as _________ number (N_A) in honor of the Italian scientist ______ ________,

Answer 5

Avogadro’s

Amedeo Avogadro

p. 93

Question 6

The currently accepted value of Avogadro’s number is:

Answer 6

6.0221418 x 10²³

Question 7

The molar mass of a substance can be used to convert from grams to moles. The molar mass (M) of a substance is the ____ in _____ of 1 mole of the substance. By definition, the mass of a mole of carbon-12 is exactly 12 g.

Answer 7

mass in grams of 1 mole of the substance