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19 December, 23:53

What is the percent composition of calcium (Ca) in CaO?

A 56g/40g x 100%

B 16g/56g x 100%

C 40g/56g x 100%

D 40g/100% x 56g

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Answers (2)
  1. 20 December, 00:05
    0
    C 40 g/56 g * 100 %

    Explanation:

    Calculate the mass of each component and the total mass.

    Element Atomic mass/u No. of atoms Subtotal mass/u

    Ca 40.08 1 40.08

    O 16.00 1 16.00

    Total = 56.08

    The formula for mass percent is

    % by mass = Mass of component/Total mass * 100 %

    In this problem

    % Ca = mass of Ca/mass of CaO * 100 %

    % H = 40.08 g/56.08 g * 100 %
  2. 20 December, 00:08
    0
    its either a or c but im not certain just try putting both of those in google to narrow the results.
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