⚖️ 质量分数（质量百分比）计算器Mass Percent Calculator

使用说明与常见问题How-to & FAQ

「质量分数（质量百分比）计算器」是什么？What is the Mass Percent Calculator tool?

计算溶液或混合物中某组分的质量分数 = 组分质量 ÷ 总质量 × 100%；也可以输入化学式，求每种元素在化合物中的质量百分比。Calculate mass percent = component mass ÷ total mass × 100% for a solution or mixture, or enter a formula to get the mass percent of each element in a compound.

如何使用「质量分数（质量百分比）计算器」？How do I use the Mass Percent Calculator tool?

在「质量分数（质量百分比）计算器」中，填写「计算」、「溶质（组分）质量」、「溶剂（其余部分）质量」、「化学式」等参数，结果会随输入实时计算并显示在下方。In the Mass Percent Calculator: Fill in "Calculate", "Solute (component) mass", "Solvent (rest) mass", "Formula"; results are recalculated instantly as you type.

质量分数公式？What is the formula?

质量分数 = 组分质量 ÷（组分质量 + 其余质量）× 100%。注意分母是溶液总质量，不是溶剂质量：25 g 盐溶于 100 g 水是 20%，不是 25%。Mass percent = component mass ÷ (component + rest) × 100%. The denominator is the whole solution, not the solvent: 25 g of salt in 100 g of water is 20%, not 25%.

元素质量百分比怎么算？How are element percentages found?

元素质量百分比 = 原子数 × 原子量 ÷ 摩尔质量 × 100%，原子量用 IUPAC 标准原子量。Element % = number of atoms × atomic weight ÷ molar mass × 100%, using IUPAC standard atomic weights.

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

「质量分数（质量百分比）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 Mass Percent 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.

「质量分数（质量百分比）计算器」免费吗？需要注册吗？Is the Mass Percent Calculator free? Do I need an account?

「质量分数（质量百分比）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 Mass Percent 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.