A 100.0 mL sample of 0.200 M aqueous monoprotic acid is added to 100.0 mL of 0.150 M rhobonium hydroxide, in a calorimeter whose heat capacity (excluding any water) is 480.J/K. The following reaction occurs when the two solutions are mixed, calculate dH for the reaction, as written. 2 HA + Ro(OH)2 RoA2 + 2 H20 dH = ? Answers kJ/mol Your answer should have three significant figures.

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

The excretory system,need answers for all: )

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.