r lite teaering and-? what is 0.872 in kcal . Google takeCovalentActivity. do? l

Question

r lite teaering and-? what is 0.872 in kcal . Google takeCovalentActivity. do? locator assignment-take&takeAssignmentSession; ocatoreassignment-take Use the References to access important values if needed for this question. Osygen gas can be prepared by heating potassium chlorate according to the following equation The product gas, 0, is collected over water at a temperature of 25 C and a pressure of 757 mm Hg. Ifthe wet O, gas formed occupies a volume of 6.80 L, the number of grams of 02 formed is 25 °C. The apor pressure of water is 23.8 mm Hg at Submit Answer Retry Entire Group 9 more group attempts remalining 8 0

Explanation / Answer

Balanced equation:
2 KClO3 ====> 2 KCl + 3 O2
Reaction type: decomposition

Let us calculate the moles of O2 produced in the reaction.

PV= nRT

P = Pressure in atm                       V= Volume in Liter

n = no of moles               R = 0.0821 L atm K-1 Mol-1

T = Temperature in Kelvin

Pressure of oxygen = 757 - 23.8 = 733.2 mmHg = 0.9647 atm

V = 6.8 Liter

T = 25 Deg Cel = 298 K

substitute the values in the equation

n = PV / RT = 0.9647 x 6.8 / 0.08206 x 298 = 0.2682 Moles

Grams O2 produced = 0.2682 x 32 = 8.58 gm

8.58 gm of Oxygen is produced

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