Ch 2 and 3- Amount of Substance

Question 1

Define Relative Atomic Mass (A_r):

Answer 1

The weighted mean mass of an atom of an element relative to 1/12th of carbon-12

Question 2

Define Relative Molecular Mass (M_r):

Answer 2

the ratio of the average mass of one molecule of an element or compound to one twelfth of the mass of an atom of carbon-12.

Question 3

Define Relative Isotopic Mass:

Answer 3

Mass of an isotope relative to 1/12th of mass of an atom of carbon-12

Question 4

Define relative formula mass:

Answer 4

sum of the relative atomic masses of the atoms in a species or ion.

Question 5

What is Avogadro’s constant?

Answer 5

6.02 x 10²³

Question 6

How to calculate no. particles?

Answer 6

no moles x 6.02x10²³

Question 7

What is the formula triangle for volume in gases?

Answer 7

Question 8

What is the normal moles formula triangle?

Answer 8

Question 9

What is the formula triangle used to calculate moles in solutions?

Answer 9

Question 10

What is the calculation for percentage yield?

Answer 10

Question 11

What is the calculation for atom economy?

Answer 11

Question 12

Describe how to calculate:

• ºC to K
• kPa to Pa
• 1atm in Pa

Answer 12

Question 13

What is the ideal gas equation?

Answer 13