To calculate the mass of 0.61 moles of Vaseline (C15H15N), you need to determine the total molar mass of Vaseline and then multiply it by the number of moles.
The molecular formula of Vaseline (C15H15N) indicates that it consists of 15 carbon (C) atoms, 15 hydrogen (H) atoms, and 1 nitrogen (N) atom.
To calculate the molar mass of Vaseline, you need to multiply the atomic mass of each element by the number of atoms present and then sum them up:
Molar mass of C15H15N = (15 * atomic mass of C) + (15 * atomic mass of H) + (1 * atomic mass of N)
Given: Atomic mass of C = 12.0 g/mol Atomic mass of H = 1.0 g/mol Atomic mass of N = 14.0 g/mol
Molar mass of Vaseline = (15 * 12.0) + (15 * 1.0) + (1 * 14.0) = 180.0 + 15.0 + 14.0 = 209.0 g/mol
Now, you can calculate the mass of 0.61 moles of Vaseline by multiplying the molar mass by the number of moles:
Mass = Number of moles * Molar mass = 0.61 mol * 209.0 g/mol = 127.49 g (rounded to two decimal places)
Therefore, the mass of 0.61 moles of Vaseline is approximately 127.49 grams.