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🧂 质量摩尔浓度计算器Molality Calculator
按 b = 溶质物质的量 ÷ 溶剂质量（kg）计算溶液的质量摩尔浓度（mol/kg）；溶质可输入物质的量，或化学式加质量。Calculate molality, b = moles of solute ÷ kilograms of solvent (mol/kg); give the solute as moles, or as a formula and mass.
使用说明与常见问题How-to & FAQ
「质量摩尔浓度计算器」是什么？What is the Molality Calculator tool?
按 b = 溶质物质的量 ÷ 溶剂质量（kg）计算溶液的质量摩尔浓度（mol/kg）；溶质可输入物质的量，或化学式加质量。Calculate molality, b = moles of solute ÷ kilograms of solvent (mol/kg); give the solute as moles, or as a formula and mass.
如何使用「质量摩尔浓度计算器」？How do I use the Molality Calculator tool?
在「质量摩尔浓度计算器」中，填写「溶质输入方式」、「溶质化学式」、「溶质质量 g」、「溶质物质的量 mol」、「溶剂质量」等参数，结果会随输入实时计算并显示在下方。In the Molality Calculator: Fill in "Solute input", "Solute formula", "Solute mass g", "Solute moles mol", "Solvent mass"; results are recalculated instantly as you type.
质量摩尔浓度和物质的量浓度有什么区别？Molality or molarity?
质量摩尔浓度 b = mol ÷ kg 溶剂，不随温度变化；物质的量浓度 c = mol ÷ L 溶液，溶液体积会随温度变化。稀水溶液中两者数值接近。Molality is mol ÷ kg of solvent and does not change with temperature; molarity is mol ÷ L of solution, whose volume does. For dilute water solutions they are close.
溶剂质量是溶液质量吗？Is the solvent mass the solution mass?
不是，只算溶剂本身。比如 58.44 g NaCl 溶于 1 kg 水，溶剂质量是 1 kg，而不是 1.058 kg。No, only the solvent. Dissolving 58.44 g of NaCl in 1 kg of water, the solvent mass is 1 kg, not 1.058 kg.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「质量摩尔浓度计算器」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 Molality 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.
「质量摩尔浓度计算器」免费吗？需要注册吗？Is the Molality Calculator free? Do I need an account?
「质量摩尔浓度计算器」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 Molality 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.