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🧮 物质的量（摩尔）计算器Mole Calculator
在质量、物质的量和粒子数之间换算：n = m ÷ M，N = n × Nₐ；摩尔质量可直接输入，也可由化学式自动算出。Convert between mass, moles and number of particles with n = m ÷ M and N = n × Nₐ; enter the molar mass or let a formula supply it.
使用说明与常见问题How-to & FAQ
「物质的量（摩尔）计算器」是什么？What is the Mole Calculator tool?
在质量、物质的量和粒子数之间换算：n = m ÷ M，N = n × Nₐ；摩尔质量可直接输入，也可由化学式自动算出。Convert between mass, moles and number of particles with n = m ÷ M and N = n × Nₐ; enter the molar mass or let a formula supply it.
如何使用「物质的量（摩尔）计算器」？How do I use the Mole Calculator tool?
在「物质的量（摩尔）计算器」中，填写「已知」、「数值」、「化学式（填了就不用摩尔质量）」、「摩尔质量 g/mol」等参数，结果会随输入实时计算并显示在下方。In the Mole Calculator: Fill in "Known", "Value", "Formula (overrides molar mass)", "Molar mass g/mol"; results are recalculated instantly as you type.
用的是哪些公式？What are the formulas?
n = m ÷ M，m = n × M，N = n × Nₐ。M 为摩尔质量（g/mol），由化学式和 IUPAC 标准原子量算出，Nₐ = 6.02214076 × 10²³ mol⁻¹。n = m ÷ M, m = n × M and N = n × Nₐ, with M the molar mass (g/mol) from the formula and IUPAC standard atomic weights, and Nₐ = 6.02214076 × 10²³ mol⁻¹.
只知道粒子数能算质量吗？Can I get mass from a particle count?
可以，但需要化学式或摩尔质量；不填时只给出物质的量和粒子数（已知物质的量时也一样）。只有已知质量时才必须有摩尔质量。Yes, if you give a formula or molar mass; without one the tool shows moles and particles only (the same when moles are known). Molar mass is required only when the known value is a mass.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「物质的量（摩尔）计算器」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 Mole Calculator 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.
「物质的量（摩尔）计算器」免费吗？需要注册吗？Is the Mole Calculator free? Do I need an account?
「物质的量（摩尔）计算器」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 Mole Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.