Polychlorinated biphenyls (pcbs), which were formerly used in the manufacture of electrical transformers, are environmental and health hazards. they break down very slowly in the environment. the decomposition of pcbs can be represented by the equation:

2c12h4cl6 + 23o2 + 2h2o yields 24co2 + 12hcl

a) how many moles of water are needed to react 10.0 mol o2?

b) how many grams of hcl are produced when 15.2 mol h2o react?

c) how many moles of co2 are produced when 76.5 g hcl are produced?

d) how many grams of c12h4cl6 are reacted when 100.25 g co2 are produced?

e) how many grams of hcl are produced when 2.5 kg c12h4cl6 react?

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude

Kp is the equilibrium constant for dissociation of the propionic acid dimer. what is the sign of the slope for a plot of the natural logarithm of kp vs. inverse temperature for this reaction?