Question

3) During an environmental assessment of a natural wetland in the Everglades, it was determined that 1.5 cubic meters of the dry native soil had a mass of 420 kg. Determine the mass of a cubic foot of the same soil. Hint: calculate the density of the soil and then use the density to calculate the mass associated with 1 ft of the Everglades soil. (mass = 7.9 kg or 17.38 lbm or 0.54 slug) 4) A research has added 2.06 g of the salt sodium nitrate, NaNO3, to a cylinder containing water. The cylinder diameter is 2 inches and the depth of the water in the cylinder is 4 inches. Determine the concentration of salt in solution, showing younanswer in the units specified (sketch first) a) mg/L b) mass % c) molarity

Answer 1

Problem.3

1 cubic meters = 3.28×3.28×3.28 ft3 = 35.31 ft3,

So 1.5 m3 = 1.5× 35.31 ft3 = 52.931 ft3

So 1 ft3 weighs 420/52.931 = 7.93 kgs = 17.38 lbm = 0.54 slugs.

(1 lbm = 1/32.173 slugs)