molal

IPA/ˈməʊ.ləl/
IPA/ˈmoʊ.ləl/

molal — 形容詞

  • molalpositive
  • more molalcomparative
  • most molalsuperlative

1. describing a solution in which the concentration is expressed as moles of dissol

1.形容詞C1
釋義

重量莫耳的

每公斤溶劑含一莫耳溶質的

describing a solution in which the concentration is expressed as moles of dissolved substance per unit mass of solvent

例句

The lab technician prepared a 0.5-molal potassium chloride solution because its concentration is unchanged by cooling.

實驗室技術員配製了 0.5 重量莫耳的氯化鉀溶液，因為其濃度不會因冷卻而改變。

attributive use: [number]-molal solution of [substance]

Professor Amara explained that molal concentration stays the same even when the temperature changes.

Amara 教授解釋說，即使溫度改變，重量莫耳濃度仍保持不變。

collocation: molal concentration

常見搭配
  • molal solution
  • molal concentration
  • [number]-molal
  • molal quantity
  • molal freezing-point depression
同義詞
  • molality-based

    less common, descriptive compound used when emphasizing the measurement system

反義詞
  • molar

    refers to concentration per liter of solution rather than per kilogram of solvent

文法句型

[number]-molal solution of [substance]

molal [noun]

用法筆記

Frequently used attributively before nouns such as 'solution' or 'concentration'. Unlike 'molar', molal values do not change with temperature because they are based on mass rather than volume.

常見錯誤

We prepared a 1-molal solution by adding one mole of salt to one liter of water.
We prepared a 1-molal solution by adding one mole of salt to one kilogram of water.
Molal concentration uses mass of solvent (kilograms), not volume (liters).
The molal concentration changed when we heated the solution.
The molal concentration stayed the same when we heated the solution.
Molality is based on mass, which does not change with temperature, unlike molarity.

同根字

  • molality
    名詞C1
  • mole
    名詞B2
  • molar
    形容詞C1
  • molarity
    名詞C1

常見搭配

名詞搭配

常用片語

  • per kilogram of solvent
  • moles per kilogram