Formulas and Values

Question 1

How to calculate enthalpy changes?

Answer 1

1. q = mc🔺T in g and J
2. Convert to kJ
3. 🔺H = -q / moles (kJmol-1)

Question 2

What formulas to use in titration calculations?

Answer 2

1. c = m / v
2. m = mol x Mr

Question 3

Formulas for dilution calculations?

Answer 3

1. (moles =) C1 x V1 = C2 x V2
2. V2 - V1 for how much diluting solution to be added
3. V2 / V1 (dilution factor)

Question 4

What are the values for standard conditions?

Answer 4

Pressure: 101000 Pa / 101 kPa
Temperature: 298 K
Concentration: 1.0 moldm-3

Question 5

Wha is the formula for ideal gas law?

Answer 5

PV = nRT

Question 6

What are the values for ideal gas law?

Answer 6

P = 101000 Pa
V = in m3 (convert by x10-6 from cm3 and x10-3 from dm3)
n = moles
R = 8.314 K-1mol-1
T = K (convert by +/- 273 from degrees Celsius)

Question 7

What is Avogadro’s constant?

Answer 7

6.02 x 10^23 (1 mole of atoms)