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Bezzdna [24]
3 years ago
12

500 grams of a soil is taken and dried completely in bright sunshine. The mass of dried soil is found to be 450 grams. The perce

ntage of water present in the given sample of soil is: (1 Point) 15% 5% 10%
Chemistry
1 answer:
satela [25.4K]3 years ago
4 0
The Correct Answer Is 15% Since The Mass Of The Dried Soil Is 170g.
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2 years ago
Phosphorus pentachloride decomposes according to this equation. PCl5(g) equilibrium reaction arrow PCl3(g) + Cl2(g) An equilibri
melisa1 [442]

Answer:

PCl₅ = 0.03 X 208 = 6.24g

PCl₃ = 0.05 X 137 =6.85 g

Cl₂ = 0.03X71 = 2.13 g

Explanation:

The equilibrium constant will remain the same irrespective of the amount of reactant taken.

Let us calculate the equilibrium constant of the reaction.

Kc=\frac{[PCl_{3}][Cl_{2}]}{[PCl_{5}]}

Let us calculate the moles of each present at equilibrium

moles=\frac{mass}{molarmass}

molar mass of PCl₅=208

molar mass of PCl₃=137

molar mass of Cl₂=71

moles of PCl₅ = \frac{mass}{molarmass}=\frac{4.13}{208}=0.02

moles of PCl₃= \frac{mass}{molarmass}=\frac{8.87}{137}=0.06

moles of Cl₂ = \frac{mass}{molarmass}=\frac{2.90}{71}=0.04

the volume is 5 L

So concentration will be moles per unit volume

Putting values

Kc = \frac{\frac{0.06}{5}\frac{0.04}{5}}{\frac{0.02}{5}}=0.024

Now if the same moles are being transferred in another beaker of volume 2L then there will change in the concentration of each as follow

                PCl_{5}--->PCl_{3}+Cl_{2}

Initial                 0.02           0.06       0.04

Change             -x                   +x          +x

Equilibrium     0.02-x           0.06+x    0.04+x

Conc.                (0.02-x)/2       (0.06+x)/2   (0.04+x)/2

Putting values

0.024 = \frac{(0.06+x)(0.04+x)}{(0.02-x)2}

Solving

(0.024(2)(0.02-x)=(0.06+x)(0.04+x)

0.00096-0.048x=0.0024+x^{2}+0.1x

0.148x+x^{2}+0.00144=0

x = -0.01

so the new moles of

PCl₅ = 0.02 + 0.01  =0.03

PCl₃ = 0.06-0.01 = 0.05

Cl₂ = 0.04-0.01 = 0.03

mass of each will be:

mass= moles X molar mass

PCl₅ = 0.03 X 208 = 6.24g

PCl₃ = 0.05 X 137 =6.85 g

Cl₂ = 0.03X71 = 2.13 g

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3 years ago
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Two types of chemical composition that characterize minerals are compounds and elements.
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Lonic Bonds are created by
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Answer:

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