📚 IGCSE WJEC Chemistry: Mastering Calculation Questions | IGCSE WJEC 化学计算题专项训练
Calculation questions form a significant part of the IGCSE WJEC Chemistry examination, testing your ability to apply quantitative reasoning to chemical reactions, formulas, and energetics. This revision guide provides targeted practice and step-by-step methods for every calculation type you are likely to encounter, from basic mole concepts to atom economy and titration analyses. By mastering these techniques, you will build confidence in handling numbers precisely and efficiently under exam conditions.
计算题是IGCSE WJEC化学考试的重要组成部分，考查你将定量推理应用于化学反应、化学式和能量变化的能力。本复习指南针对你可能遇到的每一类计算题提供了专项训练和分步方法，从基础的摩尔概念到原子经济性和滴定分析。通过掌握这些技巧，你将建立信心，在考试条件下精确高效地处理数字。
1. The Mole Concept and Molar Mass | 摩尔概念与摩尔质量
The mole is the chemist’s counting unit. One mole of any substance contains 6.02 × 10²³ particles (Avogadro’s constant). The mass of one mole of a substance in grams is its molar mass (M), which is numerically equal to its relative atomic mass (Aᵣ) or relative formula mass (Mᵣ). To find the amount in moles (n), use: n = mass (g) / molar mass (g/mol).
摩尔是化学家的计数单位。1摩尔任何物质含有6.02 × 10²³个粒子（阿伏伽德罗常数）。1摩尔物质的质量以克为单位是其摩尔质量（
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