A chemist reacts 30.0 mL of 5.6 M HCl with an excess of Mg(OH)2 How many grams of magnesium will be produced

2.042 g

Explanation:

The reaction that takes place is:

First we calculate how many HCl moles were added, using the given volume and concentration:

Then we convert HCl moles into Mg²⁺ moles, using the stoichiometric coefficients:

Finally we convert Mg moles into grams, using its molar mass:

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answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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