Express your answer to two significant figures and include the appropriate units

Question

Oxalic acid, a compound found in plants and vegetables such as rhubarb, has a mass percent composition of 26.7  C, 2.24  H, and 71.1  O. Oxalic acid can interfere with respiration and cause kidney or bladder stones. If a large quantity of rhubarb leaves is ingested, the oxalic acid can be toxic. The lethal dose () in rats for oxalic acid is 375 . Rhubarb leaves contain about 0.5  by mass of oxalic acid.

1. Using the LD50 , how many grams of oxalic acid would be toxic for a 150 −lb person?

2. How many kilograms of rhubarb leaves would the person in part c need to eat to reach the toxic level of oxalic acid?

Answer 1

1) I assume LD₅₀ is in mg/kg of body mass: 150 lb (.4546 kg/lb)(375 mg/kg)(1g/1000mg) =

2) grams OA from (1) * (1 grams Rhubarb/.5 grams OA)