Equations

Question 1

What is the molar gas equation at RTP?

What does this equation mean?

Answer 1

n (moles) = V (dm3) / 24 (dm3)

1 mole of any gas = 24 dm3 at RTP.
Hence molar gas volume has the units 24 dm3 mol-1.

Question 2

What is the equation for percentage yeild?

Answer 2

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

2 methods:
1) (Actual mass / theoretical mass) x 100
2) (Actual moles / theoretical moles) x 100

Question 3

What is the equation to calculate the number of particles?

Answer 3

number of particles = moles x Avogadro’s constant (6.02 x 10*23)

Question 4

What is the formula for the number of optical isomers?

Answer 4

2*n

n = number of chiral centers.

Question 5

What is the equilibrium constant expression?

Answer 5

Kc = [C]c [D]d / [A]a [B]b

Question 6

What is the equation to calculate heat energy?

Answer 6

q = m x c x ΔT

q = heat transferred in J
m = mass of water in g
c = the specific heat capacity
ΔT = the temperature change

Question 7

What is the definition of the standard bond enthalpy of reaction?

Answer 7

enthalpy change for bonds broken - enthalpy change for bonds formed