Calculate the enthalpy of the reaction 2no(g)+ o 2 (g)→2n o 2 (g) given the following reactions and enthalpies of formation: 1 2 n 2 (g)+ o 2 (g)→n o 2 (g), δ h ∘ a =33.2 kj 1 2 n 2 (g)+ 1 2 o 2 (g)→no(g), δ h ∘ b =90.2 kj

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.