Calculate the mass percent composition of O in each compound. a. calcium nitrate b. Iron(II) sulfate c. Carbon dioxi

Question

Calculate the mass percent composition of O in each compound.

a. calcium nitrate
b. Iron(II) sulfate
c. Carbon dioxide

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Sigridomena 5 years 2021-07-24T06:17:20+00:00 1 Answers 147 views 0

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  1. haidang
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    2021-07-24T06:18:43+00:00
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    Answer:

    A. Mass percent composition of oxygen = 58.5%

    B. Mass percentage composition of oxygen = 42.1%

    C. Mass percentage composition of oxygen = 72.7 %

    Explanation:

    Percentage mass composition of an element in a compound is given by the formula below:

    Percentage mass composition = mass of element/ molar mass of compound × 100%

    Percentage mass of oxygen in the given compounds are then calculated.

    a. Calcium nitrate, Ca(NO₃)₂: molar mass of compound is obtained first.

    Molar mass of Ca(NO₃)₂ = 40 + 14 × 2 + 16 × 2 × 3 = 164 g

    Mass of oxygen = 16 × 6 = 96 g

    Mass percent composition of oxygen = 96/164 × 100% = 58.5%

    b. Iron (ii) sulfate, FeSO₄: molar mass of compound is obtained first.

    Molar mass of FeSO₄ = 56 + 32 + 16 × 4 = 152 g

    Mass of oxygen = 16 × 4 = 64 g

    Mass percentage composition of oxygen = 64/152 × 100% = 42.1%

    c. Carbon dioxide, CO₂: molar mass of compound is obtained first.

    Molar mass of CO₂ = 12 + 16 × 2 = 44 g

    Mass of oxygen = 16 × 2 = 32 g

    Mass percentage composition of oxygen = 32/44 × 100% = 72.7 %

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