Question

Percent Composition from a Chemical Formula Problem - Propane (C,H,), the fuel commonly used in gas grills, is one of the compounds obtained from petroleum. Calculate the percent composition of propane. Answer

Calculating Mass using Percent Composition Problem-Calculate the mass of carbon and the mass of hydrogen in 82.0 g of propane. Answer

Answer 1

To calculate the percent composition of propane (C3H8), determine the mass of each element in one mole of the compound. Divide the mass of each element by the molar mass of the compound and multiply by 100% to find the percent composition.

Step-by-step explanation:

To calculate the percent composition of propane (C3H8), we need to determine the mass of each element in one mole of the compound. The molar mass of carbon (C) is 12.01 g/mol and the molar mass of hydrogen (H) is 1.01 g/mol.

For carbon: (3 mol C) x (12.01 g/mol) = 36.03 g of carbon

For hydrogen: (8 mol H) x (1.01 g/mol) = 8.08 g of hydrogen

To find the percent composition, divide the mass of each element by the molar mass of the compound and multiply by 100%.

Answer 2

To calculate the percent composition of propane (C3H8), we need to determine the mass of carbon and the mass of hydrogen in 82.0 g of propane.

Step-by-step explanation:

To calculate the percent composition of propane (C3H8), we need to determine the mass of carbon and the mass of hydrogen in 82.0 g of propane. First, find the molar mass of carbon and hydrogen: C = 12.01 g/mol, H = 1.01 g/mol. Next, calculate the number of moles of carbon and hydrogen in 82.0 g of propane: Moles of C = 82.0 g / 12.01 g/mol = 6.827 mol, Moles of H = 82.0 g / 1.01 g/mol = 81.19 mol.

Finally, calculate the percent composition of carbon and hydrogen:

• Percent composition of carbon = Moles of C / Total moles of propane x 100% = 6.827 mol / (6.827 mol + 81.19 mol) x 100% = 7.78%
• Percent composition of hydrogen = Moles of H / Total moles of propane x 100% = 81.19 mol / (6.827 mol + 81.19 mol) x 100% = 92.22%