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Reviewed CSCA Chemistry question · Easy

在标准状况下,将 4.48 L 的氨气完全溶于水配成 200 mL 溶液,所得氨水的物质的量浓度是多少?

  1. 1.0 mol/L
  2. 0.5 mol/L
  3. 2.0 mol/L
  4. 0.25 mol/L
Show the answer and explanation

Correct answer

A. 1.0 mol/L

Principle or equation

标准状况下气体摩尔体积为 22.4 L/mol,物质的量浓度 c = n/V。

Why this answer is correct

n(NH3) = 4.48 L / 22.4 L/mol = 0.2 mol;c = 0.2 mol / 0.200 L = 1.0 mol/L。

Example

若 2.24 L HCl 溶于水配成 100 mL 溶液,则 c = (2.24/22.4) mol / 0.1 L = 1.0 mol/L。

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