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In: Chemistry

KEY PART that is TRICKY for me: (The vapor pressure of water is 23.78 mmHg at...

KEY PART that is TRICKY for me: (The vapor pressure of water is 23.78 mmHg at 25∘C)

A common way to make hydrogen gas in the laboratory is to place a metal such as zinc in hydrochloric acid (see the figure). The hydrochloric acid reacts with the metal to produce hydrogen gas, which is then collected over water. Suppose a student carries out this reaction and collects a total of 154.0 mL of gas at a pressure of 742 mmHg and a temperature of 25∘C. What mass of hydrogen gas (in mg) does the student collect? (The vapor pressure of water is 23.78 mmHg at 25∘C.)

Can someone please help me with this problem, because I am losing my mind. I thought the answer was going to be either 12.3 mg or 12.4 mg, but that's without factoring in the vapor pressure of water, and I do not know what to do with that information. Please help. Thank you.

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Please find enclosed the answers in the image files.

queen_honey_blossom answered 1 year ago
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