To determine which sample has the greatest mass, we need to use the molar mass of each substance to calculate the mass of each sample. The molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol).
The molar mass of camphor (C10H16O) is approximately 152.23 g/mol. Therefore, 0.37 mol of camphor has a mass of:
mass = moles x molar mass = 0.37 mol x 152.23 g/mol = 56.34 g
The molar mass of ammonia (NH3) is approximately 17.03 g/mol. Therefore, 4.2 mol of ammonia has a mass of:
mass = moles x molar mass = 4.2 mol x 17.03 g/mol = 71.43 g
The molar mass of krypton (Kr) is approximately 83.80 g/mol. Therefore, 9.3 mol of krypton has a mass of:
mass = moles x molar mass = 9.3 mol x 83.80 g/mol = 779.34 g
The molar mass of iodine vapor (I2) is approximately 253.81 g/mol. Therefore, 4.0 mol of iodine vapor has a mass of:
mass = moles x molar mass = 4.0 mol x 253.81 g/mol = 1015.24 g
The molar mass of formaldehyde (CH2O) is approximately 30.03 g/mol. Therefore, 1.6 mol of formaldehyde has a mass of:
mass = moles x molar mass = 1.6 mol x 30.03 g/mol = 48.05 g
Therefore, the sample with the greatest mass is 4.0 mol of iodine vapor, which has a mass of 1015.24 g.