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18 June, 08:09

One half of a balanced chemical equation is shown.

3Mg (OH) 2 + 2H3PO4

Which lists the numbers of each atom the other half of the equation would contain?

3 Mg, 2 P, 14 O, 12 H

Mg, 2 P, 14 O, 6 H

3 Mg, 8 P, 7 O, 6 H

6 Mg, 6 P, 2 O, 12

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Answers (2)
  1. 18 June, 08:29
    0
    3Mg, 2P, 14O, 12 H

    Explanation:

    Since it is a balanced equation, the number of atoms of each element would be equal on both sides of the equation

    Let's do it by elimination:

    The easiest element to calculate is Mg. Since there is a 3 before Mg (OH) 2, number of Mg atoms = 3

    This leaves us with either option 1 or 3.

    Let's check the number of Phosphorous atoms. Since there is a number 2 before phosphoric acid, the number of P atoms is 2. Hence the first option is correct.

    Let's check:

    Number of Oxygen atoms = 3 (2) + 2 (4) = 14

    Number of Hydrogen atoms = 3 (2) + 3 (2) = 12

    Thus, option 1 is correct.

    Do note that numbers that appears before a compound applies to all the elements in that compound, numbers that appear after a letter (element) applies only to that element, and numbers that come after a bracket applies to all the elements within the bracket.
  2. 18 June, 08:34
    0
    One half of a balanced chemical equation is shown.

    3Mg (OH) 2 + 2H3PO4

    Which lists the numbers of each atom the other half of the equation would contain?

    3 Mg, 2 P, 14 O, 12 H

    Mg, 2 P, 14 O, 6 H

    3 Mg, 8 P, 7 O, 6 H

    6 Mg, 6 P, 2 O, 12

    Answer: A
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