Gases produced by a chemical reaction can easily be collected over water.


Screenshot 2024 01 19 231559

Screenshot 2024 01 19 231559

Given is the reaction,

Mg(s) + 2HCl (aq) ⟶MgCl2(aq) + H2(g)

Total pressure of gas collected over water =755.0mmHg

Temperature=25.50C

We found out the pressure of hydrogen gas formed in mmHg.

Explanation:

We use the formula , PTotal=Pgas + Pwater the given gas is hydrogen so we use formula as PTotal=PH2+PH2O

Step 2 of 2

As the given gas is hydrogen which is collected over water and PTotal=755.0mmHg and PH2O=25.0 mmHg at 25.5oC

and PH2=?

PTotal=PH2+PH2O

PH2=PTotal-PH2O

PH2= (755.0-25.0) mmHg = 730.0mmHg

So, the pressure of hydrogen gas is 730.0mmHg

Final solution

Pressure of hydrogen gas (PH2) = 730.0 mmHg.

 

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