Free Solved Given is the reaction, Mg(s) + 2HCl (aq) ⟶MgCl2(aq) + H2(g) Total pressure of gas collected over water =755.0mmHg Temperature=25.50C


It is asked in the question that the total pressure of gas.
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.
Total Pressure of gas = 730.0mmHg.

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