Amount of Substance

Question 1

What is the unit for amount of substance?

Answer 1

• moles/mol

Question 2

What is the value for Avogadro’s constant?

Answer 2

• 6.02x10²³g mol^-1

Question 3

What is the molar gas volume at rtp?

Answer 3

• 24dm³

Question 4

What is the definition of molecular formula?

Answer 4

• the NO° + type of atoms of each element in a formula

Question 5

What is the definition of empirical formula?

Answer 5

• the simplest whole NO° ratio of atoms of each element present in a compound

Question 6

What happens to the particles when a gas is heated?

Answer 6

• particles gain more KE
• more frequent collisions per second
• more successful collisions per second

Question 7

What is the ideal gas equation?

Answer 7

PV = nRT

• P = pressure (KPa)
• V = volume (cm3)
• n = NO° of moles (mol)
• R = gas constant (8.314 J mol^-1K^-1
• T = T°C (K)

Question 8

How do you calculate percentage yield?

Answer 8

% yield = (actual yield / theoretical yield) x 100

Question 9

What is the equation for atom economy?

Answer 9

• atom economy = (Mr of desired product / Mr of all reactants) x 100