Questions: Calculate the number of hydrogen atoms in 1.11 mol of acetaldehyde, C2H4O.

Solution Steps

Acetaldehyde has the chemical formula \(\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}\). From the formula, we can see that each molecule of acetaldehyde contains 4 hydrogen atoms.

Avogadro's number is \(6.022 \times 10^{23}\) molecules per mole. Therefore, the number of molecules in 1.11 mol of acetaldehyde is: \[ 1.11 \, \text{mol} \times 6.022 \times 10^{23} \, \text{molecules/mol} = 6.6844 \times 10^{23} \, \text{molecules} \]

Since each molecule of acetaldehyde contains 4 hydrogen atoms, the total number of hydrogen atoms in 1.11 mol of acetaldehyde is: \[ 6.6844 \times 10^{23} \, \text{molecules} \times 4 \, \text{H atoms/molecule} = 2.6738 \times 10^{24} \, \text{H atoms} \]

Final Answer