Equations

Question 1

Atom economy

Answer 1

(Mr of desired product / mr of all products) x100

Question 2

Number of particles

Answer 2

Number of moles X Avogadro constant

Question 3

Relative atomic mass on abundance graphs

Answer 3

(Mass of isotopes X % abundance on graph) / 100

Question 4

Percentage yield

Answer 4

(Actual yield / predicted yield) x100

Question 5

Ideal gas equation?

Answer 5

PV = nRT

Question 6

What is P in the ideal gas equation?

Answer 6

Pressure
In Pa
KPa to Pa = x1000

Question 7

What is V in the ideal gas equation?

Answer 7

Volume
In M^3
Cm^3 to M^3 = x10^-6
Dm^3 to M^3 = x10^-3

Question 8

What is n in the ideal gas equation?

Answer 8

Number of moles

Question 9

What is R in the ideal gas equation?

Answer 9

Gas constant

8.134 Jmol^-1K^-1

Question 10

What is T in the ideal gas equation?

Answer 10

Temperature
In K
°C to K = +273

Question 11

Assumptions of ideal gas equation?

Answer 11

Random motion of molecules
Elastic collisions
Negligible size of molecules
No intermolecular forces between molecules

Question 12

Calculating concentration of diluted solution

Answer 12

1. Stock solution / final volume of diluted solution made = A
2. A x concentration of stock solution

Question 13

Energy absorbed

Answer 13

q=mc🔺T

Question 14

Enthalpy change of combustion

🔺rH

Answer 14

Energy transferred / number of moles
Or
(Bond enthalpies of reactants) - (bond enthalpies of products)

Question 15

Standard conditions

Temp and pressure

Answer 15

298k

100kPa