⚗️ 化学计量计算器（质量换算、限量反应物、产率）Stoichiometry Calculator (Mass to Mass, Limiting Reactant, Percent Yield)

使用说明与常见问题How-to & FAQ

「化学计量计算器（质量换算、限量反应物、产率）」是什么？What is the Stoichiometry Calculator (Mass to Mass, Limiting Reactant, Percent Yield) tool?

按配平方程式的系数比做化学计量：由一种反应物的质量求产物的理论质量；输入两种反应物的质量找出限量反应物和过量剩余；输入实际产量求产率。可直接输入化学式自动计算摩尔质量。本地处理。Stoichiometry from the coefficients of a balanced equation: the theoretical mass of product from one reactant; the limiting reactant and leftover excess from two reactant masses; and percent yield from the actual amount obtained. Enter chemical formulas to compute molar masses automatically. Processed locally.

如何使用「化学计量计算器（质量换算、限量反应物、产率）」？How do I use the Stoichiometry Calculator (Mass to Mass, Limiting Reactant, Percent Yield) tool?

在「化学计量计算器（质量换算、限量反应物、产率）」中，填写「反应物质量 g」、「反应物 M」、「产物 M」、「反应物系数」、「产物系数」等参数，结果会随输入实时计算并显示在下方。In the Stoichiometry Calculator (Mass to Mass, Limiting Reactant, Percent Yield): Fill in "Reactant mass g", "Reactant M", "Product M", "Reactant coeff", "Product coeff"; results are recalculated instantly as you type.

化学计量怎么算？How does stoichiometry work?

质量 ÷ 摩尔质量 = 物质的量；乘以配平方程式中产物与反应物的系数比；再乘以产物的摩尔质量得到理论质量。例如 2H₂ + O₂ → 2H₂O，4 g H₂ 理论上生成约 35.7 g 水。Mass ÷ molar mass gives moles; multiply by the product-to-reactant coefficient ratio from the balanced equation; multiply by the product molar mass for the theoretical mass. In 2H₂ + O₂ → 2H₂O, 4 g of H₂ makes about 35.7 g of water.

限量反应物是什么？What is the limiting reactant?

先用完的反应物，它决定最多能生成多少产物。比较各反应物的“物质的量 ÷ 系数”，最小的就是限量反应物，其余有剩余。The reactant that runs out first and caps the amount of product. Compare moles ÷ coefficient for each reactant; the smallest is limiting and the others are left over.

产率怎么算？How is percent yield calculated?

产率 = 实际产量 ÷ 理论产量 × 100 %。由于副反应和损失，实际产率通常低于 100 %。Percent yield = actual yield ÷ theoretical yield × 100 %. Side reactions and losses usually keep it below 100 %.

能举个计算实例吗？Can you show a worked example?

例如在「化学计量计算器（质量换算、限量反应物、产率）」中填 反应物质量 g = 40，反应物 M = 40，产物 M = 60，反应物系数 = 1，产物系数 = 1，结果区显示：产物质量 g：60For example, entering Reactant mass g = 40, Reactant M = 40, Product M = 60, Reactant coeff = 1, Product coeff = 1 in the Stoichiometry Calculator (Mass to Mass, Limiting Reactant, Percent Yield) gives: Product mass g: 60

哪些输入会被检查？Which inputs are validated?

「化学计量计算器（质量换算、限量反应物、产率）」会检查这些输入——「反应物质量 g」、「反应物系数」、「产物系数」：必须填写，须大于 0；「反应物 M」：不填反应物化学式时必须填写，须大于 0；「产物 M」：不填产物化学式时必须填写，须大于 0；「第二反应物质量 g（可选）」：须大于 0；「第二反应物 M」：填了第二反应物质量且没填其化学式时必须填写，须大于 0；「第二反应物系数」：必须填写，须大于 0；「实际产量 g（可选）」：可留空，不能为负；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Stoichiometry Calculator (Mass to Mass, Limiting Reactant, Percent Yield) checks its inputs — "Reactant mass g", "Reactant coeff", "Product coeff": required, must be greater than 0; "Reactant M": required unless a reactant formula is given, must be greater than 0; "Product M": required unless a product formula is given, must be greater than 0; "Second reactant mass g (optional)": must be greater than 0; "Second reactant M": required when a second reactant mass is given without its formula, must be greater than 0; "Second reactant coeff": required, must be greater than 0; "Actual yield g (optional)": optional, cannot be negative; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「化学计量计算器（质量换算、限量反应物、产率）」的设置：「反应物质量 g」默认 10；「反应物 M」默认 40；「产物 M」默认 60；「反应物系数」默认 1；「产物系数」默认 1；「反应物化学式（可选，覆盖 M）」可留空；「产物化学式（可选，覆盖 M）」可留空；「第二反应物质量 g（可选）」可留空；「第二反应物 M」可留空；「第二反应物系数」默认 1；「第二反应物化学式（可选）」可留空；「实际产量 g（可选）」可留空。每次生成结果都按当前设置处理。Settings in the Stoichiometry Calculator (Mass to Mass, Limiting Reactant, Percent Yield) — "Reactant mass g" default 10; "Reactant M" default 40; "Product M" default 60; "Reactant coeff" default 1; "Product coeff" default 1; "Reactant formula (optional, overrides M)" optional; "Product formula (optional, overrides M)" optional; "Second reactant mass g (optional)" optional; "Second reactant M" optional; "Second reactant coeff" default 1; "Second reactant formula (optional)" optional; "Actual yield g (optional)"…

计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?

「化学计量计算器（质量换算、限量反应物、产率）」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Stoichiometry Calculator (Mass to Mass, Limiting Reactant, Percent Yield) uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.

「化学计量计算器（质量换算、限量反应物、产率）」免费吗？需要注册吗？Is the Stoichiometry Calculator (Mass to Mass, Limiting Reactant, Percent Yield) free? Do I need an account?

「化学计量计算器（质量换算、限量反应物、产率）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Stoichiometry Calculator (Mass to Mass, Limiting Reactant, Percent Yield) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.