CHEM 150 Practice Exams
Midterm I · 30 Questions · 90 Minutes · Units 17
Constants
N = 6.022 × 10²³ mol¹ 1 u = 1.660 × 10² kg
R = 8.314 L·kPa/(mol·K) = 0.08206 L·atm/(mol·K)
1 atm = 101.325 kPa = 760 mmHg = 760 torr
STP: 0°C, 1 atm molar volume = 22.4 L/mol
Key Formulas
PV = nRT PV/T = PV/T P_total = Σ Pᵢ Pᵢ = xᵢ × P_total
[P + n²a/V²][V nb] = nRT (van der Waals)
P_A = x_A × P°_A (Raoult) S_g = k × P_g (Henry)
π = MRT FC = VE ½(BE) LP
% yield = (actual/theoretical) × 100% MᵢVᵢ = MᶠVᶠ
Bond Dissociation Energies (kJ/mol)
HH 436 CH 414 CC 347 C=C 611 CC 837
CO 360 C=O 799 NN 946 O=O 498 HO 464 HN 391
Electronegativity Values (Pauling)
H:2.1 C:2.5 N:3.0 O:3.5 F:4.0
P:2.1 S:2.5 Cl:3.0 Br:2.8 I:2.5
Na:0.9 Mg:1.2 Al:1.5 Si:1.8 Ca:1.0 K:0.8