Amount of Substance

Question 1

What is the equation for moles of a gas?

Answer 1

volume(dm^3)/24

Question 2

What is the ideal gas equation?

Answer 2

PV = nRT

Question 3

What is the value of R in the ideal gas equation?

Answer 3

8.31

Question 4

What are the units the pressure in the ideal gas equation?

Answer 4

Pascals (Pa)

Question 5

What are the units for volume in the ideal gas equation??

Answer 5

Meters cubed (m^3)

Question 6

What are the units for temperature in the ideal gas equation?

Answer 6

Kelvin (K)

Question 7

How do you change centigrade into kelvin?

Answer 7

+ 273

Question 8

How do you change m^3 into cm^3?

Answer 8

x10^6

Question 9

How do you change atmospheres into pascals?

Answer 9

x101.325(kPa) x1000 (Pa)

Question 10

Equation for concentration using moles

Answer 10

moles/volume

Question 11

Equation for concentration (g/dm^3)

Answer 11

concentration (mol/dm^3) x Mr

Question 12

Equation for percentage yield

Answer 12

Actual yield
———————– x 100
theoretical yield

Question 13

3 reasons why actual yield is smaller than theoretical yield

Answer 13

• equilibrium and not to completion
• side reactions may occur
• reactants may be impure
• products or reactants lost in transfer

Question 14

Equation for atom economy

Answer 14

Mr of desired product
———————————————– x 100
Mr of all products

Question 15

Why do efficient processes have a high atom economy?

Answer 15

Less waste produced

Question 16

Why do addition reactions have 100% atom economy?

Answer 16

Only one product