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vazorg [7]
2 years ago
11

Q3. Consider the reaction; Mg + O2 → MgO Calculate the mass of magnesium oxide possible if 2.5 g Mg reacts with 3.0 g O2? *

Chemistry
1 answer:
r-ruslan [8.4K]2 years ago
7 0

<u>Answer</u>:

mass of  magnesium oxide is 4.2 grams.

<u>Explanation</u>:

                     Balanced equation:  2Mg + O2 → 2MgO.

Given that 2.5 g Mg reacts with 3.0 g O2

  • mass = moles * Mr
  • moles = mass/Mr
  • Mr = mass/moles

First find the moles of Mg:

moles = mass/Mr

moles = 2.5/ 24

moles = 0.104 moles

Using molar ratio, magnesium oxide will have same moles as Mg as they both have "2" molar ratio. So moles of Mg is 0.104 moles.

mass = moles * Mr

mass = 0.104 * 40

mass - 4.1667 g

mass = 4.2 g ___________this is the mass of MgO

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