Which reaction is exothermic? -CH4 + 2O2 Right arrow. CO2 + 2H2O + 891 kJ
-NH4NO3 + H2O + 25 kJ Right arrow. NH4+(aq) + NO3-(aq)
-2H2O + 286 kJ Right arrow. 2H2 + O2
-N2 + O2 + 181 kJ Right arrow. 2NO

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

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.

Amixture with the same composition throughout is!