https://soh-cah-toa.pages.dev/tags/c3/ Recent content in C3 on SOH-CAH-TOA Hugo en-us Thu, 02 Jul 2026 23:00:10 +0700 https://soh-cah-toa.pages.dev/mark-schemes/chemistry/stoichiometry_ms/ Thu, 02 Jul 2026 23:00:10 +0700 https://soh-cah-toa.pages.dev/mark-schemes/chemistry/stoichiometry_ms/ <h1 id="stoichiometry-marking-scheme">Stoichiometry Marking Scheme</h1> <blockquote> <p>This is the marking scheme for quiz: <a href="https://soh-cah-toa.pages.dev/quizzes/chemistry/stoichiometry_quiz/">C3 - Stoichiometry Quiz</a><br> Topic Guide: <a href="https://soh-cah-toa.pages.dev/guides/chemistry/stoichiometry/">C3 - Stoichiometry</a></p> </blockquote> <h2 id="section-a-multiple-choice-5-marks">Section A: Multiple Choice (5 Marks)</h2> <ol> <li><strong>B</strong> [1] ($\text{Ca}(40) + 2\times\text{O}(16) + 2\times\text{H}(1) = 40 + 32 + 2 = 74$)</li> <li><strong>D</strong> [1] ($24\text{ dm}^3 = 24,000\text{ cm}^3$)</li> <li><strong>C</strong> [1] (Empirical $M_r$: $12 + 2 = 14$. $56 / 14 = 4$. $\text{C}_4\text{H}_8$)</li> <li><strong>A</strong> [1] (Ratio $2:1$. 2 moles $\text{H}_2$ need 1 mole $\text{O}_2$. 2 moles $\text{O}_2$ available $\rightarrow \text{H}_2$ runs out first)</li> <li><strong>A</strong> [1] ($M_r \text{ NaCl} = 58.5$. $0.5 \times 58.5 = 29.25$ g)</li> </ol> <hr> <h2 id="section-b-short-answer-15-marks">Section B: Short Answer (15 Marks)</h2> <ol start="6"> <li> <p>$2\text{NaOH}(aq) + \text{H}_2\text{SO}_4(aq) \rightarrow \text{Na}_2\text{SO}_4(aq) + 2\text{H}_2\text{O}(l)$</p> https://soh-cah-toa.pages.dev/quizzes/chemistry/stoichiometry_quiz/ Thu, 02 Jul 2026 22:45:56 +0700 https://soh-cah-toa.pages.dev/quizzes/chemistry/stoichiometry_quiz/ <h1 id="stoichiometry-quiz">Stoichiometry Quiz</h1> <p><strong>Duration</strong>: 45 Minutes <strong>Total Marks</strong>: 30</p> <hr> <h2 id="section-a-multiple-choice-5-marks">Section A: Multiple Choice (5 Marks)</h2> <ol> <li> <p>What is the relative formula mass ($M_r$) of $\text{Ca(OH)}_2$?<br> ($A_r$: $\text{Ca} = 40, \text{O} = 16, \text{H} = 1$)<br> A. 58<br> B. 74<br> C. 82<br> D. 90 <br> <br></p> </li> <li> <p>Which of the following represents the correct molar gas volume at r.t.p.?<br> A. 1 mole = $22.4\text{ dm}^3$<br> B. 1 mole = $24\text{ dm}^3$<br> C. 1 mole = $24,000\text{ cm}^3$<br> D. Both B and C <br> <br></p>