At the start of 1980,the average lead content in blood had dropped to about 10 μg/dL blood.How many mg is that in 2.0 gallons of blood? (1 gallon = 3.7854 L)

Question

Quizplus · Accepted Answer

To convert μg/dL (micrograms per deciliter) to mg/2.0 gallons (milligrams per 2.0 gallons), we first need to convert gallons to deciliters and then multiply by the lead concentration in μg/dL.

2.0 gallons = 2.0 x 3.7854 L/gallon = 7.57 L
10 μg/dL = 0.1 mg/dL (since 1 mg = 1000 μg)

Now we can calculate:
0.1 mg/dL x 7.57 L = 0.757 mg/2.0 gallons

Rounding to two significant figures gives us the final answer of 0.76 mg/2.0 gallons, which corresponds to choice C.

At the Start of 1980,the Average Lead Content in Blood