CHEMISTRY HIGH SCHOOL

Consider the reaction: K2S(aq)+Co(NO3)2(aq)=2KNO3(aq)+CoS(s) what volume of 0.255 M K2S solution is required to completely react with 160 mL of 0.130 M Co(NO3)2?

Answers

Answer 1

Answer:

The volume will be "81.6 mL".

The given reaction is:

$K_2S(aq)+Co(NO_3)_2(aq) \rightarrow 2KNO_3(aq)+CoS(s)$

The values are:

Molarity of $K_2S$ ,

$M_1 = 0.215 M$

Volume of $Co(NO_3)_2$ ,

$V_2 = 160 \ mL$

Molarity of $C0(NO_3)_2$ ,

$M_2 = 0.130 \ M$

As we know,

→ $V_1 = (M_2 V_2)/(M_1)$

By substituting the values, we get

$= (0.130* 160)/(0.255)$

$= (20.8)/(0.255)$

$= 81.6 \ mL$

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Answer 2

Answer: based off of the chemical equation given, you know that K₂S reacts with Co(NO₃)₂ in a 1 to 1 molar ratio. That means that the number of moles of both reactants need to be equal for both of them to completely react with each other.

You can find the number of moles of Co(NO₃)₂ by multiplying 0.130M by 0.160L to get 0.0208 moles of Co(NO₃)₂. That means that you need to find a volume of 0.225M K₂S that contains 0.0208 moles of K₂S. You can do this by dividing the 0.0208 by 0.255 to get 0.0816L of K₂S. That means that you need 81.6mL of 0.255M K₂S to fully react with 160mL of 0.130M Co(NO₃)₂.

I hope this helps. Let me know in the comments if anything is unclear.

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Answers

Your answer will be A

At 25C and 795 torr, carbon dioxide has a solubility of 0.0356 M in water. What is the solubility at 25 C and 2070 torr? ____ MI know that at a given temperature, the solubility of a gas in a liquid is directly proportional to its pressure but how would that be set up in an equation..?

Answers

If you want to do real scientifically, the equation is
p = kc.
We evaluate k = p/c and plug in the first set of conditions.
k = 795/0.0356 = 22,331

Then p = kc and solve for c
c = p/k = 2070/22,331 = 0.093

The mixing of solute in the solvent is called solubility. In a solution, there are two types of components, these components are solute and solvent.

Solute - a component that presents in less amount.
Solvent - a component that is present in a large amount.

According to the question, the torr is defined as the torr is a unit of pressure based on an absolute scale, defined as exactly 1/760 of a standard atmosphere.

The equation is

$p = kc$

hence, $k = (795)/(0.0356) = 22,331$

After solving the equation,

$c = (p)/(k) \n\n= (2070)/(22,331)\n\n = 0.093\n$

Hence, the solubility is 0.093.

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A 0.8115 g sample of HCl was placed into a 50 mL volumetric flask and the sample was thoroughly dissolved in water to make 50 mL of solution. It required 22.07 mL of NaOH to reach the endpoint in the titration. What is the molarity of the NaOH solution?

Answers

Answer:

Molarity of NaOH solution is 1.009 M

Explanation:

Molar mass of HCl is 36.46 g/mol

Number moles = (mass)/(molar mass)

So, 0.8115 g of HCl = $(0.8115)/(36.46)moles$ HCl = 0.02226 moles HCl

1 mol of NaOH neutralizes 1 mol of HCl.

So, if molarity of NaOH solution is S(M) then moles of NaOH required to reach endpoint is $(S* 22.07)/(1000)moles$

So, $(S* 22.07)/(1000)=0.02226$

or, S = 1.009

So, molarity of NaOH solution is 1.009 M

Which of the following elements has the ability to undergo sublimation?a. oxygen
b. carbon
c. sodium
d. iodine

Answers

The best answer to this question would be (d.) iodine. Iodine is the elements who has the ability to undergo sublimation. Iodine is an important compound in terms of nutrition, production of acetic acid and polymers. Iodine is capable of transitioning from solid to gas without any specialized process.

The answer to your question is

d. idoine

What types of elements tend to combine to form molecular compounds?

Answers

Non-metals tend to combine to form molecular compounds.

What is a Covalent compound?

Covalent compounds are made up of two or more nonmetallic elements, such as carbon and hydrogen. Covalent bonds hold the atoms of the various elements together in molecules to form a covalent compound.

Atoms share valence electrons in these chemical bonds. The atoms in the molecule are held together by the attraction between the shared electrons and the positive nuclei of both atoms.

The smallest component of a covalent compound that retains the properties of the complex is called a molecule. Thousands of atoms make up the biggest, most intricate covalent compounds.

Examples include the substances found in living things such as proteins and carbohydrates. Covalent compounds having only two atoms in their molecules are the smallest and most basic.

Many covalent compounds are easily burned, notably those that contain carbon and hydrogen. Many ionic substances, in contrast, do not burn.

In contrast to most ionic compounds, many covalent compounds do not dissolve in water. Covalent compounds cannot conduct electricity because they lack freely moving electrons, unlike ionic compounds.

Most covalent compounds have relatively low boiling temperatures because the individual molecules of covalent compounds may be separated more readily than the ions in a crystal.

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#SPJ2

Most molecular compounds are composed of the atoms of two or more nonmetals, ionic compounds on the other hand, are formed from a metal and a non metal. All of them, with the exception of the "Noble" gases (group 8 in the periodic table). Even these have been forced to form compounds under unique laboratory conditions, with the exception of Helium. No stable compound of Helium is known

What is the difference between the orbital periods of Mercury and Earth?Select one:
a. 0.61 years
b. 0.76 years
c. 1.24 years
d. 1.39 years

Answers

The correct answer is B. The difference between the orbital period of planets Mercury and Earth is 0.76 years. The orbit of mercury is the most eccentric among the planets in the Solar system and the smallest planet. It has an orbital period of 88 Earth days.

Answer:

b. 0.76 years

Explanation:

Mercury is the closest planet to the Sun and the Earth is the third planet from the Sun.

The orbital period of the Earth is 1 year.

Orbital period of the Mercury is 88 days = 0.24 years (Earth years)

Thus, the difference between the orbital periods of Mercury and Earth is

1 year - 0.24 years = 0.76 years

Thus, the correct option is b.

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