. Calculate the percent composition of hydrogen in H2O a. Step 1: b. Step 2: Solution: __ Calculate the percent composition of oxygen in CO2

a. Step 1: Determine the molar mass of $H2O$.<br />- The molar mass of hydrogen (H) is approximately 1.01 g/mol.<br />- The molar mass of oxygen (O) is approximately 16.00 g/mol.<br />- Since there are 2 hydrogen atoms in $H2O$, the total molar mass of hydrogen in $H2O$ is 2.02 g/mol.<br />- The molar mass of $H2O$ is 18.02 g/mol.<br /><br />b. Step 2: Calculate the percent composition of hydrogen in $H2O$.<br />- The percent composition of hydrogen in $H2O$ is calculated by dividing the total molar mass of hydrogen in $H2O$ by the molar mass of $H2O$ and multiplying by 100.<br />- Percent composition of hydrogen in $H2O$ = (2.02 g/mol / 18.02 g/mol) * 100 ≈ 11.19%<br /><br />Solution: The percent composition of hydrogen in $H2O$ is approximately 11.19%.<br /><br />b. Step 2: Calculate the percent composition of oxygen in $CO2$.<br />- The molar mass of carbon (C) is approximately 12.01 g/mol.<br />- The molar mass of oxygen (O) is approximately 16.00 g/mol.<br />- Since there are 2 oxygen atoms in $CO2$, the total molar mass of oxygen in $CO2$ is 32.00 g/mol.<br />- The molar mass of $CO2$ is 44.01 g/mol.<br /><br />b. Step 2: Calculate the percent composition of oxygen in $CO2$.<br />- The percent composition of oxygen in $CO2$ is calculated by dividing the total molar mass of oxygen in $CO2$ by the molar mass of $CO2$ and multiplying by 100.<br />- Percent composition of oxygen in $CO2$ = (32.00 g/mol / 44.01 g/mol) * 100 ≈ 72.73%<br /><br />Solution: The percent composition of oxygen in $CO2$ is approximately 72.73%.