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ZanzabumX [31]
3 years ago
13

Niven wants to calculate the mass of MgO that is produced by the burning of 28.0 g of Mg. What is the first step in Niven’s calc

ulation?
Chemistry
2 answers:
Elanso [62]3 years ago
8 0
I would say that Niven would have to calculate the atomic weights of Mg and O and then the total weight of MgO to get the percent of oxygen and then that way get a proportionate amount of the 28 grams of oxygen required to bond with the Mg and then add together the weight of Mg which would be 28.0 grams plus the weight of oxygen.
ICE Princess25 [194]3 years ago
3 0

Answer:

The first step would be to write a balanced reaction between Mg and O2 forming MgO

Explanation:

<u>Step 1: W</u>rite the balanced chemical reaction between Mg and O2

2Mg + O2\rightarrow 2MgO

Based on the reaction stoichiometry:

2 moles of Mg produces 2 moles of MgO.

Therefore the ratio, Mg:MgO = 1:1

<u>Step 2</u>: Calculate the moles of Mg reacted

Atomic mass of Mg = 24 g/mol

Mass of Mg reacted = 28.0 g

Moles of Mg = \frac{Mass}{Atomic\ Mass} = \frac{28.0}{24} = 1.167

<u>Step 3:</u> Calculate the mass of MgO produced

Moles of Mg reacted = moles of MgO produced = 1.167

Molar mass of MgO = 24 + 16 = 40 g/mol

Mass of MgO = moles* molar\ mass = 1.167*40 = 46.7 g

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1. What is the pH of a solution with a [H3O+] concentration of 4.32 x 10-2 M?
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1. The pH of the solution is 1.36

2. The pH of the solution is 10.47

3. the concentration of [H₃O⁺] in the solution is 6.3×10⁻¹⁴ M

<h3>What is pH ? </h3>

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion (hydronium ion) concentration while the poH measures the hydroxide ion concentration. It is expressed mathematically as

pH = –Log H₃O⁺

<h3>1. How to determine the pH</h3>
  • [H₃O⁺] = 4.32×10⁻² M
  • pH = ?

pH = –Log H₃O⁺

pH = –Log 4.32×10⁻²

pH = 1.36

<h3>2. How to determine the pH</h3>
  • [H₃O⁺] = 3.4×10⁻¹¹ M
  • pH = ?

pH = –Log H₃O⁺

pH = –Log 3.4×10⁻¹¹

pH = 10.47

<h3>3. How to determine the concentration of [H₃O⁺]</h3>
  • pH = 13.2
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pH = –Log H₃O⁺

13.2 = –Log H₃O⁺

Multiply through by -1

-13.2 = Log H₃O⁺

Take the anti-log of -13.2

H₃O⁺ = anti-log (-13.2)

H₃O⁺ = 6.3×10⁻¹⁴ M

Learn more about pH:

brainly.com/question/3709867

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The volume of 0.6305 kg of a liquid is 0.430 L. What is its density in g/mL
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