Question 1 4 out of 4 points 8.278 x 10-4 mol of an unidentified gaseous substance effuses through a tiny hole in 86.9 s Under identical conditions, 1.740 x 10-4 mol of argon gas takes 81.3 s to effuse. What is the molecular weight of the substance? Express your answer in g/mol. Notes: 1. Express you answer in 3 significant figures 2. Do not write in scientific, exponential notation