what is the percent by mass of oxygen in carbon dioxide (co₂)? use %element = \\frac{total mass of element…

what is the percent by mass of oxygen in carbon dioxide (co₂)? use %element = \\frac{total mass of element in compound}{molar mass of compound}×100. 27.29% 57.12% 72.71% 79.99%

what is the percent by mass of oxygen in carbon dioxide (co₂)? use %element = \\frac{total mass of element in compound}{molar mass of compound}×100. 27.29% 57.12% 72.71% 79.99%

Answer

Explanation:

Step1: Calculate molar mass of C

The molar mass of carbon (C) is $12.01\ g/mol$.

Step2: Calculate molar mass of O

The molar mass of oxygen (O) is $16.00\ g/mol$. In $CO_2$, there are 2 oxygen atoms, so the total mass of oxygen in $CO_2$ is $2\times16.00 = 32.00\ g/mol$.

Step3: Calculate molar mass of $CO_2$

The molar mass of $CO_2$ is the sum of the molar - mass of C and the total molar - mass of O in it. So, $M_{CO_2}=12.01 + 32.00=44.01\ g/mol$.

Step4: Calculate percent by mass of O in $CO_2$

Using the formula $%\text{Element}=\frac{\text{total mass of element in compound}}{\text{molar mass of compound}}\times100$, we substitute the values: $%\text{O}=\frac{32.00}{44.01}\times100\approx72.71%$.

Answer:

72.71%