Experience the Quality With Free ACS General Chemistry Exam Questions That Helps Candidates Pass

KMT: negligible volume and IMFs, random motion, average KE ∝ T(K).

pKa = −log Ka = −log(6.6 × 10⁻⁴) ≈ 3.18. ACS exam stresses converting Ka to pKa and interpreting relative acid strength (smaller pKa = stronger acid). Missteps include forgetting negative sign.

Thermodynamic relation: ΔG° = −nFE°, where n = electrons transferred, F = Faraday’s constant. This links electrochemistry and thermodynamics. Distractors test sign/unit confusion.

M(Na₂SO₄) = (23×2 + 32 + 16×4) = 142 g·mol⁻¹. Mass = 0.250 × 142 = 35.5 g. Correct answer is A (not B).

Fe atomic number = 26 → 26 protons. Mass = 56 → neutrons = 56 − 26 = 30. Fe³⁺ means 3 fewer electrons = 23.