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Part A A common way to make hydrogen gas in the laboratory is to place a metal...

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Chemistry

Part A

A common way to make hydrogen gas in the laboratory is to placea metal such as zinc in hydrochloric acid (see the figure). Thehydrochloric acid reacts with the metal to produce hydrogen gas,which is then collected over water. Suppose a student carries outthis reaction and collects a total of 145.8 mL of gas at a pressureof 749 mmHg and a temperature of 25∘C. What mass of hydrogen gas(in milligrams) does the student collect? (The vapor pressure ofwater is 23.78 mmHg at 25∘C.)

Part B)

Consider the following chemical reaction:

2H2O(l)→2H2(g)+O2(g)

What mass of H2O is required to form 1.6 L of O2 at atemperature of 320 K and a pressure of 0.987 atm ?

Express your answer using two significant figures.

Part C)

What volume of O2 gas, measured at 760 mmHg and 17 ∘C, isrequired to completely react with 50.8 g of Al?

Express the volume in liters to three significant figures.

Answer & Explanation Solved by verified expert
3.7 Ratings (492 Votes)
Part A Let us see what are the given parameter Volume V 1458 mL 01458 L The pressure of gas is due to hydrogen gas and water vapours so pressure Ptotal PH2 P H2O vapours 749 PH2 2378 PH2 72522 mmHg Also 760 mmHg 1 atm So 72522mmHg 0954 atm To calculate mass we will    See Answer
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