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?
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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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