Suppose a reaction was run that produces hydrogen gas and a sample of H2 (g) collected. As a result of the collection 145 ml of water is displaced. the pressures of the gas and atmospheric pressure are equalized using the method described in this experiment. The atmospheric pressure is 745 mm Hg. The temperature of the water and gas are identical at 22 C / How many moles of H2 have have been evolved?

Question

Chemistry

Ronin Saunders

12 August, 15:43

Suppose a reaction was run that produces hydrogen gas and a sample of H2 (g) collected. As a result of the collection 145 ml of water is displaced. the pressures of the gas and atmospheric pressure are equalized using the method described in this experiment. The atmospheric pressure is 745 mm Hg. The temperature of the water and gas are identical at 22 C / How many moles of H2 have have been evolved?

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Camden Parks · Answer 1

0.0059mol

Explanation:

From the ideal gas equation

PV=nRT

P=Pressure

V=Volume

R=Ideal gas constant

T=Temperature

n=number of mole

P=745mmHg

760mmHg=1atm

745mmHg=0.98atm

volume of water displaced=volume of hydrogen produced=145ml=0.145L

R=0.082Latm/mol/K

T=22°C=273+22=293K

no of mole=PV/RT

=0.98*0.145/0.082*293

=0.1421/24.026

=0.0059mol

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