If cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? view available hint(s) if is dissolved
2 answers:
<u>Answer:</u> The correct answer is its concentration is half that of the ion.
<u>Explanation:</u>
We are given a chemical compound having formula
It is an ionic compound because it is formed by the combination of ion
When an ionic compound is dissolved in water, it breaks into its ions. The chemical equation for the ionization of calcium chloride follows:
By stoichiometry of the reaction:
1 mole of calcium chloride produces 1 mole of calcium ions and 2 moles of chloride ions
From above, it is visible that number of chloride ions is twice that of calcium ion and so will be its concentration.
Thus, the concentration of calcium ions will be half that of chloride ions.
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Answer:
Explanation:
To solve this problem, we must understand the relationship between mass of a substance and the number of atoms.
Atoms are the smallest indivisible particles of any matter. A substance can be made up of several number of atoms in their space.
The mass of any substance is a function of the amount of atoms its contains.
The mass of a substance is related in chemistry to the amount of atoms its contains using the parameter called the number of moles.
A mole is the amount of substance that contains the Avogadro's number of particles. This number is 6.02 x 10²³ particles. The particles here can be protons, neutrons, electrons, atoms e.t.c.
Now,
Number of moles =
Molar mass of copper = 63.6g/mole
Number of moles = = 0.03mole
Since 1 mole of a substance contains 6.02 x 10²³atoms
0.03 mole of copper will contain 0.03 x 6.02 x 10²³atoms
= 1.89 x 10²² atoms
He needs to add 1.89 x 10²² atoms to make 2g of the sample.