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3 years ago

What is the molarity of a solution that has 6 mol of CaCl2 in 3 kg le water?

Chemistry

1 answer:

guajiro [1.7K]3 years ago

5 0

Answer:

2 M

Explanation:

Molarity is defined as the ratio of moles of a solute to the volume of a solution.

In this problem, we're dissolving calcium chloride in 3 kg of water. We may assume that calcium chloride will dissolve fully in water and won't contribute to an increase in volume of a solution, so we may approximate that the volume of this solution is equal to the volume of water.

In order to find the volume of water, we need to divide its mass by the density of water.

Since the temperature is not given, we may assume a standard density of water of $d = 1 kg/L$ .

According to the molarity equation:

$c_{CaCl_2} = \frac{n_{CaCl_2}}{V}=\frac{n_{CaCl_2}}{\frac{m_{H_2O}}{d_{H_2O}}} =\frac{n_{CaCl_2}d_{H_2O}}{m_{H_2O}} =\frac{6 mol\cdot 1 kg/L}{3 kg} = 2 M$

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1 year ago

Without consulting any tables, arrange the following substances in order and explain your choice of order: (a) Mg21, Ar, Br2, Ca

Olenka [21]

Explanation:

(a) When we move across a period then there occurs a decrease in atomic size of the elements due to increase in force of attraction between the protons and electrons of an atom.

On the other hand, when we move down a group then there will occur an increase in atomic size of the elements due to increase in number of electrons which will also increase number of shells.

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When we move across a period from left to right then there occurs a decrease in atomic size of the atoms. Therefore, ionization energy increases along a period but decreases along a group.

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