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3 years ago

Which is an example of a precipitation reaction?

Chemistry

1 answer:

netineya [11]3 years ago

6 0

B. Precipitates are formed when two solutions combine to form another solution and a solid.

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Benzene and toluene form ideal solutions. Consider a solution of benzene and toluene prepared at 25 ^ { \circ } \mathrm { C }25∘

ss7ja [257]

Answer:

The composition of benzene is 0.77 and the composition of toluene is 0.23

Explanation:

The Raoult´s law is:

$P=P_{A} ^{o} x_{A} +P_{B} ^{o} x_{B}$

Where

P = total pressure of solution benzene-toluene

PA⁰= vapor pressure of benzene = 95 torr

PB⁰ = vapor pressure of toluene = 28 torr

xA = mole fraction of benzene

xB = mole fraction of toluene

$x_{A} +x_{B} =1\\x_{A}=x_{B}\\Replacing\\x_{A}=0.5\\x_{B}=0.5$

The total pressure of the solution is:

$P=(95*0.5)+(28*0.5)=61.5torr$

The composition of benzene and toluene:

$Benzene=\frac{P_{A}^{o} }{P} =\frac{95*0.5}{61.5} =0.77\\Toluene=\frac{P_{B}^{o} }{P} =\frac{28*0.5}{61.5} =0.23$

4 0

3 years ago

What is the pOH of a 0.00037 M solution of barium hydroxide

ruslelena [56]

Answer: pOH = 3.13

Ba(OH)2 is a very basic substance. The general formula for pOH is - log(OH)

Barium Hydroxide produces 2 moles of OH for every mole of Ba(OH)2 present in the solution.

0.00037 M = 3.7 * 10^-4 Ba(OH)2 will produce 2 *0.00037 M of OH-

OH- = 2* 0.00037 = 0.00074

pOH = - log(0.00074) = 3.13

5 0

3 years ago

(1 point) Hydrogen fluoride (HF) has a lower molecular weight compared to hydrogen chloride (HCl), yet its boiling temperature i

Setler79 [48]

Answer:

The correct option is: D. Two types of secondary (or intermolecular) bonding are present between hydrogen fluoride molecules, whereas only one type of secondary bonding is present between hydrogen chloride molecules

Explanation:

Boiling point of a chemical substance depends on the molecular mass and the intermolecular forces, which are the interactive forces present between chemical species

1. The molecular mass of hydrogen fluoride (HF) is less than hydrogen chloride (HCl).

2. But the intermolecular forces present between the HF molecules are stronger than the intermolecular forces present between the HCl molecules.

This is because hydrogen fluoride exhibits two types of intermolecular forces: strong hydrogen bonding and dipole-dipole interactions. Whereas, hydrogen chloride exhibits only one type of intermolecular force i.e. dipole-dipole interactions.

Therefore, as a net result, the boiling point of HF is higher than the boiling point of HCl.

3 0

3 years ago

A gas sample of 5 moles, has a volume of 95 L. How many moles of the same gas should I add to obtain a volume of 133 L at the sa

tigry1 [53]

97 mols I think approximately

4 0

3 years ago

Compare natural selection to evolution. Be sure to justify your response in two or more complete sentences in the essay

Wittaler [7]

Answer:

Natural selection is a process in which organisms are fit to adapt and live in the environment. Natural selection was an idea developed by Charles Darwin, Darwin contributed this idea when he was studying birds and tortoises at the Galapagos Islands. He then wrote his famous book, Origin of Species. Evolution is also very similar, evolution is a process in which organisms reproduce and mutate in order to survive and adapt. As you can see, natural selection and evolution are alike in many ways.

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5 0

3 years ago