Question

step by step explanation ​

Answer 1

first add all the terms together= 2+3+5=10

then find percentage

$carbon=\frac{2}{10} \times 100 = 20\%\\</p><p></p><p>calcium= \frac{3}{10} \times 100 = 30\% \\ oxygen= \frac{5}{10} \times 100 = 50\%$

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