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🧪 摩尔分数计算器Mole Fraction Calculator
输入混合物中各组分的物质的量（mol），或化学式和质量（g），计算每个组分的摩尔分数 χ、摩尔百分比和总物质的量。Enter each component of a mixture as moles, or as a formula and mass in grams, to get each mole fraction χ, mole percent and the total moles.
使用说明与常见问题How-to & FAQ
「摩尔分数计算器」是什么？What is the Mole Fraction Calculator tool?
输入混合物中各组分的物质的量（mol），或化学式和质量（g），计算每个组分的摩尔分数 χ、摩尔百分比和总物质的量。Enter each component of a mixture as moles, or as a formula and mass in grams, to get each mole fraction χ, mole percent and the total moles.
如何使用「摩尔分数计算器」？How do I use the Mole Fraction Calculator tool?
在「摩尔分数计算器」中，填写「输入方式」等参数，结果会随输入实时计算并显示在下方。In the Mole Fraction Calculator: Fill in "Input"; results are recalculated instantly as you type.
摩尔分数怎么算？How is mole fraction calculated?
χᵢ = nᵢ ÷ Σn，即该组分的物质的量除以混合物的总物质的量，没有单位，所有组分之和为 1。χᵢ = nᵢ ÷ Σn, the moles of one component divided by the total moles. It has no unit and all fractions add up to 1.
用质量输入时怎么换算？How are masses converted?
按化学式算出摩尔质量（IUPAC 标准原子量），n = 质量 ÷ 摩尔质量。The molar mass comes from the formula with IUPAC standard atomic weights, and n = mass ÷ molar mass.
摩尔分数和质量分数一样吗？Is it the same as mass fraction?
不一样。上面的例子中乙醇占质量的 33.8%，但只占物质的量的 16.7%，因为乙醇分子更重。No. In the default example ethanol is 33.8% of the mass but only 16.7% of the moles, because its molecules are heavier.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「摩尔分数计算器」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 Fraction 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.
「摩尔分数计算器」免费吗？需要注册吗？Is the Mole Fraction Calculator free? Do I need an account?
「摩尔分数计算器」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 Fraction 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.