Question

What is the percent by mass of oxygen in carbon dioxide (CO2)? Use mc008-1. Jpg. 27. 29% 57. 12% 72. 71% 79. 99%.

Answer 1

The percent by mass of oxygen in carbon dioxide ($CO_2$) is 72.71%.

Scientific data:

• Molar mass of oxygen gas = 32 g/mol.

• Molar mass of carbon = 12 g/mol.

To calculate the percent by mass of oxygen in carbon dioxide ($CO_2$):

First of all, we would calculate the molar mass of carbon dioxide ($CO_2$);

$CO_2 = 12 +(16\times 2)\\\\CO_2 = 12 +32\\\\CO_2 = 44\;g/mol$

For the percent by mass of oxygen:

$O_2 = \frac{Mass\; of \;O_2}{Mass\; of \;CO_2} \times 100$

Substituting the parameters into the formula, we have;

$O_2 = \frac{32}{44} \times 100\\\\O_2 = 0.7271 \times 100$

Percent mass of oxygen = 72.71%

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