A 20.0-g sample of sucrose contains 8.4 g of carbon. What is the mass percentage of carbon in sucrose? 42.00% 27.76% 68.00% 72.24%

To find the mass percentage of carbon in sucrose, we can use the formula:<br /><br />\[ \text{Mass percentage} = \left( \frac{\text{Mass of carbon}}{\text{Total mass of sucrose}} \right) \times 100\% \]<br /><br />Given:<br />- Mass of carbon = 8.4 g<br />- Total mass of sucrose = 20.0 g<br /><br />Plugging in the values:<br /><br />\[ \text{Mass percentage} = \left( \frac{8.4 \, \text{g}}{20.0 \, \text{g}} \right) \times 100\% \]<br /><br />\[ \text{Mass percentage} = 0.42 \times 100\% \]<br /><br />\[ \text{Mass percentage} = 42.00\% \]<br /><br />Therefore, the mass percentage of carbon in sucrose is 42.00%.