Given
Volume of oxygen gas = volume of container = 5.00 L
Temperature of gas = 25 + 273 = 298 K
Pressure of oxygen gas = 1.73 atm
Mass of HgO originally placed into the container = ?
Decomposition reaction of HgO is, 2 HgO (s) 2 Hg (s) + O 2 (g)
From reaction, 2 mol HgO 2 mol Hg 1 mol O 2
First calculate no. of moles of HgO from the no. of moles of oxygen produced in the reaction.
We have, P V = n R T
where, P is a pressure of a gas, V is a volume of a gas, n is no. of moles of gas, R is a gas constant and T is temperature of gas.
No. of moles of oxygen gas ( n ) = P V / R T
No. of moles of oxygen gas ( n ) = ( 1.73 atm 5.00 L ) / ( 0.082057 L atm mol -1 K -1 298 K )
No. of moles of oxygen gas ( n ) = 0.3537
From reaction, 1 mol O 22 mol HgO
0.3537 mol O 2 ( 2 0.3537 / 1 ) mol HgO
0.3537 mol O 2 0.7074 mol HgO
We have relation, no. of moles = Mass / Molar mass
Mass = No. of moles Molar mass
Mass of HgO = No. of moles of HgO Molar mass of HgO
Molar mass of HgO = 200.59 + 16.00 = 216.59 g/ mol
Mass of HgO = 0.7074 mol 216.59 g/ mol = 153 g
ANSWER : Mass of HgO originally placed into the container = 153 g
Answer: 2.3. A sample of mercury(II) oxide is placed in a 5.00 L evacuated container and...
A sample of mercury(II) oxide is placed in a 5.00 L evacuated container and heated until it decomposes entirely to mercury metal and oxygen gas. The container is then cooled to 25 degrees C. One now finds that the gas pressure inside the container is 1.73 atm. what mass of mercury (II) oxide was originally placed into the container? my answer is 153 g.... please show work and explain
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The great French chemist Antoine Lavoisier discovered the Law of Conservation of Mass in part by doing a famous experiment in 1775. In this experiment Lavoisier found that mercury(II)oxide, when heated, decomposed into liquid mercury and an invisible and previously unknown substance: oxygen gas. D 1. Write a balanced chemical equation, including physical state symbols, for the decomposition of solid mercury(II)oxide (HgO) into liquid mercury and gaseous dioxygen 2. Suppose 87.0 mL of dioxygen gas are produced by this reaction,...