12. Classify the following as conduction, convection or radiation. a. A steel mug kept near a stove becomes hot after some time.
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Answer : The mass percentage of barium in the compound is, 53.8 %
Explanation : Given,
Mass of barium compound = 441 mg
Mass of barium sulfate = 403 mg = 0.403 g (1 mg = 0.001 g)
The balanced chemical reaction will be:
First we have to calculate the moles of
Molar mass of = 233.38 g/mole
Now we have to calculate the moles of barium ion.
From the balanced chemical reaction, we conclude that
As, 1 mole of barium sulfate produced from 1 mole of barium ion
So, 0.001727 mole of barium sulfate produced from 0.001727 mole of barium ion
Now we have to calculate the mass of barium ion.
Molar mass of barium = 137.3 g/mol
Now we convert the mass of barium ion from gram to mg.
Conversion used : (1 g = 1000 mg)
Mass of barium ion = 0.2371 g = 237.1 mg
Now we have to calculate the mass percentage of barium in the compound.
Mass percent of barium =
Thus, the mass percentage of barium in the compound is, 53.8 %
The total pressure in the container after the three gases are mixed is 6 atm and the partial pressure of He is 1 atm.
<h3>What is Dalton's Law of Partial Pressure ?</h3>According to Dalton's Law of Partial Pressure , the pressure exerted by a mixture of gas is equal to the sum of the partial pressure of the gases in the mixture.
P(total) = p₁ +p₂+p₃+.....
As the volume of the containers are same and the
n = 1*5/RT for Helium
n = 2*5 /RT for Neon
n= 3*5/RT for Argon
Mole fraction = moles of the element/Total moles
Moles fraction of Helium is
= 1/6
Total Pressure in the container = 1 + 2 +3 = 6 atm
The partial pressure of Helium will be
=Mole fraction * Total pressure
=(1/6)*6 atm
= 1 atm , as the volume is same the temperature is same , the pressure will also be same.
To know more about Dalton's Law
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