Answer:To calculate the maximum mass of C₂H4O that can safely be present in a room with a volume of 3.00 x 10^5 L, we need to convert the concentration limit of 8.17 x 10^-6 M to mass. The molar mass of C₂H4O is 44.06 g/mol. Therefore, the maximum mass of C₂H4O that can safely be present in the room is:
8.17 x 10^-6 M x 44.06 g/mol x 3.00 x 10^5 L = 10.9 g
So, the maximum mass of C₂H4O that can safely be present in the room is 10.9 g.