The valency of chlorine is one.why?​

The molarity of the solution made by dissolving 298 g of KCl in enough water to make 2 L of the solution is 2 M

• We'll begin by calculating the number of mole in 298 g of potassium chloride, KCl. This can be obtained as follow:

Mass of KCl = 298 g

Molar mass of KCl = 39 + 35.5 = 74.5 g/mol

Mole of KCl =?

Mole = mass / molar mass

Mole of KCl = 298 / 74.5

Mole of KCl = 4 moles

• Finally, we shall determine molarity of the KCl solution. This can be obtained as follow:

Mole of KCl = 4 moles

Volume = 2 L

Molarity of KCl =?

Molarity = mole / Volume

Molarity of KCl = 4 / 2

Molarity of KCl = 2 M

Therefore, the molarity of the KCl solution is 2 M.

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Answer:

2 M

Explanation:

The equation for molarity is "M = moles/liters"

Potassium chloride's atomic mass is 74.55, meaning one mole of KCl is equal to 74.55g. In the equation, 298g of KCl is being used. To find out how many moles this is, multiply 298g of KCl by (1 mol/74.55g of KCl) to get 4.0 moles. Now you can use the equation for molarity.

M = 4.0 moles/2 Liters

The combustion reaction of the unknown compound can be written as follows:

Other part of the question is discussed below:

We know that 3.50 g of the compound produced 5.13 g of carbon dioxide and 2.10 g of water. This means that 1.63 g of oxygen were also produced in the reaction.

The mass of oxygen in the original sample is equal to the mass of oxygen produced in the reaction, so the original sample contained 1.63 g of oxygen.

The total mass of carbon and hydrogen in the original sample is equal to the mass of the sample minus the mass of oxygen, which is 3.50 g - 1.63 g = 1.87 g.

We can find the number of moles of hydrogen in the original sample by dividing the mass of hydrogen by the molar mass of hydrogen (1.008 g/mol). This gives us 1.87 g / 1.008 g/mol = 1.86 moles of hydrogen.

Therefore, the answer is 1.86

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Final answer:

By dividing the mass of water produced in combustion by the molar mass of Hydrogen in water, we find that the original compound contained 1.05 mol of Hydrogen.

Explanation:

To determine the mole amount of Hydrogen in the compound, you have to consider the reaction applied, and how it applies to the law of conservation of mass. Combustion of the compound produces carbon dioxide (CO2) and water (H2O). For water, one mol equals to the molar mass of H which is 1 g/mol, times the amount of H in water which is 2 to get 2 g/mol. Now knowing that 2.10 g of water were produced from combustion, we divide this by the molar mass of H-in-water to get the number of hydrogen moles in the original sample. So, the calculation will be 2.10 g/ 2 (g/mol) = 1.05 mol. So, the original compound contained 1.05 mol of hydrogen.

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Mutation can be defined as the change in the genetic sequence that is hereditary. The example of beneficial mutation can be the change of rabbit color to help him hide from the predators.

What are mutagens?

The mutation can be caused by the exposure of the gene sequence to the mutagen that cause the hereditary change.

The mutagens can be UV radiation, high energy, radiation, chemicals, or environmental factors.

The beneficial mutation can be given as the mutation in which the organism has been benefitted. The change in the color pf rabbit benefit him in hiding from the predators. Thus, option A has been the example of the beneficial mutation.

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Answer:

A

Explanation:

1. Option C, unsaturated compounds are those which have multiple bonds (double, triple bonds between carbon atoms). Among the given, only C has double bond between Carbon atoms hence unsaturated compound.

2. Option A, there is only one pair of electrons between nitrogen atoms . One single covalent bond between two Nitrogen atoms by two electrons or one electron pair.