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insens350 [35]
3 years ago
11

Question 2 of 10

Chemistry
2 answers:
maxonik [38]3 years ago
8 0

Answer:-

B : Krypton and Xenon

Explanation :-

Because they are noble gases. They have 8 electrons in their outermost shells and have similar chemical properties.

dsp733 years ago
4 0

Answer:

O A Arsenic and antimony

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Calculate the molarity of a solution with 114.95 grams of sodium dissolved in 2 L of water. ​
koban [17]

Answer:

The molarity of a solution is 2.5 M

Explanation:

Molarity is a concentration unit that describes how much of a solution is dissolved in solution.

Molarity of a solution can found by using the formula,

Molarity (M) = (moles of solute)/(Liters of Solution).

Given, mass of Sodium = 114.95 grams.

Volume of water = 2 L.

Here, Sodium is solute as it is dissolved in water, which is the solvent.

Moles of Sodium(solute) can be found by using the formula,

Number of Moles = mass/Molecular weight.

mass of Sodium = 114.95 grams.

Molecular weight = 22.989 grams

Number of Moles of Sodium(solute) =114.95/22.989 = 5.

Substituting the values in the formula, we get,

M = 5/2 = 2.5 M

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