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Nostrana [21]
3 years ago
8

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

Chemistry
1 answer:
Mkey [24]3 years ago
3 0

Answer:

2.042 g

Explanation:

The reaction that takes place is:

  • 2HCl + Mg(OH)₂ → Mg²⁺ + 2Cl⁻ + 2H₂O

First we <u>calculate how many HCl moles were added</u>, using <em>the given volume and concentration</em>:

  • 30 mL ⇒ 30 / 1000 = 0.030 L
  • 5.6 M * 0.030 L = 0.168 mol HCl

Then we<u> convert HCl moles into Mg²⁺ moles</u>, using the<em> stoichiometric coefficients</em>:

  • 0.168 mol HCl * \frac{1molMg^{+2}}{2molHCl}= 0.084 mol Mg⁺²

Finally we <u>convert Mg moles into grams</u>, using its<em> molar mass</em>:

  • 0.084 mol Mg⁺² * 24.305 g/mol = 2.042 g
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