Question

Mg(s) + 2 HCl (aq) _MGCL2 (Aq) + H2 (g) the total pressure of gas collected over water is 740.0 mmhg and the temperature is 21.5 ‘c what is the pressures of hydrogen gas formed in mmhg?

Answer 1

The pressure of hydrogen gas formed  is 720.8 mmHg.

What is Partial Pressure ?

The pressure exerted by a (specified) component in a mixture of gases.

We have to understand one thing that the Hydrogen, which is collected over water, will be mixed with water vapor.

This means that the total pressure of the mixture will have two components.

• the partial pressure of Hydrogen

• the vapor pressure of water at 21.5 C

The vapor pressure of water at that temperature is approximately

19.231 mmHg.

This means that

$\rm P_{total} = P_{hydrogen} + \; P_{water vapor}$

740 = $\rm P_{hydrogen}$ + 19.231

$\rm P_{hydrogen}$ = 740-19.231

$\rm P_{hydrogen}$ = 720.8 mmHg

Therefore the pressure of hydrogen gas formed  is 720.8 mmHg.

To know more about Partial Pressure

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