Density of a substance is 7.66 g/cm3. What is the mass of that substance, in pounds (lb), if it has a volume of 12.7 mL?
__________ lb. Report your answer with 3 SFs. Do NOT enter unit.
mass = volume x density
mass = 12.7 cc x 7.66 g/cc = 97.28 grams
There are 453.6 grams in 1 lb; therefore,
97.28 g x (1 lb/453.6 g) = ? lbs. Check the math. Round to 3 s.f.