Which of the following is the most precise procedure for measuring the volume of a small rock sample about the size of a nickel?
a. reading the volume at the meniscus in a 250 ml beaker
b. reading the volume at the edges in a 100 ml graduated cylinder
c. reading the volume at the meniscus in a 50 ml graduated cylinder
d. reading the volume at the edges in a 50 ml beaker

Phosgene (carbonyl chloride), cocl2, is an extremely toxic gas that is used in manufacturing certain dyes and plastics. phosgene can be produced by reacting carbon monoxide and chlorine gas at high temperatures: co(g) cl2(g)⇌cocl2(g) carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 477 ∘c . at equilibrium, the concentrations were measured and the following results obtained: gas partial pressure (atm) co 0.830 cl2 1.30 cocl2 0.220 what is the equilibrium constant, kp, of this reaction