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🧪 摩尔质量计算器Molar Mass Calculator
输入化学式（如 H2O、Ca(OH)2、CuSO4·5H2O），计算摩尔质量和各元素质量分数。Molar mass and element mass percentages from a chemical formula like H2O, Ca(OH)2 or CuSO4·5H2O.
使用说明与常见问题How-to & FAQ
「摩尔质量计算器」是什么？What is the Molar Mass Calculator?
输入化学式（如 H2O、Ca(OH)2、CuSO4·5H2O），计算摩尔质量和各元素质量分数。Molar mass and element mass percentages from a chemical formula like H2O, Ca(OH)2 or CuSO4·5H2O.
如何使用「摩尔质量计算器」？How do I use the Molar Mass Calculator?
在「摩尔质量计算器」中，填写「化学式」、「质量 g(可选，算摩尔数)」等参数，结果会随输入实时计算并显示在下方。In the Molar Mass Calculator: Fill in "Formula", "Mass g (optional, for moles)"; results are recalculated instantly as you type.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「摩尔质量计算器」使用教科书标准公式，并列出所用公式和中间值，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 Molar Mass Calculator uses standard textbook formulas and shows them, which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「摩尔质量计算器」免费吗？需要注册吗？Is the Molar Mass Calculator free? Do I need an account?
「摩尔质量计算器」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 Molar Mass 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.