Stoichiometry

Stoichiometry Marking Scheme This is the marking scheme for quiz: C3 - Stoichiometry Quiz Topic Guide: C3 - Stoichiometry Section A: Multiple Choice (5 Marks) B [1] ($\text{Ca}(40) + 2\times\text{O}(16) + 2\times\text{H}(1) = 40 + 32 + 2 = 74$) D [1] ($24\text{ dm}^3 = 24,000\text{ cm}^3$) C [1] (Empirical $M_r$: $12 + 2 = 14$. $56 / 14 = 4$. $\text{C}_4\text{H}_8$) A [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) A [1] ($M_r \text{ NaCl} = 58.5$. $0.5 \times 58.5 = 29.25$ g) Section B: Short Answer (15 Marks) $2\text{NaOH}(aq) + \text{H}_2\text{SO}_4(aq) \rightarrow \text{Na}_2\text{SO}_4(aq) + 2\text{H}_2\text{O}(l)$ ...

Stoichiometry Quiz Duration: 45 Minutes Total Marks: 30 Section A: Multiple Choice (5 Marks) What is the relative formula mass ($M_r$) of $\text{Ca(OH)}_2$? ($A_r$: $\text{Ca} = 40, \text{O} = 16, \text{H} = 1$) A. 58 B. 74 C. 82 D. 90 Which of the following represents the correct molar gas volume at r.t.p.? A. 1 mole = $22.4\text{ dm}^3$ B. 1 mole = $24\text{ dm}^3$ C. 1 mole = $24,000\text{ cm}^3$ D. Both B and C ...