Answer to Question #160772 in General Chemistry for Karrie

Question

Hydrogen produced from a hydrolysis reaction was collected over water. The total volume of h₂ (g) was 93.26 at the temperature of 25 degree C. The barometric pressure was 742 mmHg and the vapor pressure of water at 25 degrees C was 24.0 mmHg. Calculate the moles of hydrogen gas produced by the reaction

Answer 1

Volume(V) = 93.26 mL = 93.26/1000= 0.09326 L

T = 25 °C = 25 + 273 = 298 K

P = 742 - 24.0 = 718 mm Hg = 718/760 = 0.945 atm

Using ideal gas equation,

PV = nRT

Where, P = pressure

V = Volume

n = mole

R = Gas constant

T = Temperature

putting the values

0.945 × 0.09326 = n × 0.0821 × 298

n = 0.00360 mol

So, moles of Hydrogen gas produced = [0.00360] mol