Could someone help with as many of these as they can? 1.how many moles of h20 are needed to make 0.82 moles of NaOH
2. if a reaction used 22.6g of Na2O how many moles of H2O are needed to react with it
3. how many grand of NaOH would be formed by placing 3.64g of Na2O in excess water​

How are elements arranged in a periodic table

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.

The identities of substances are the same before and after which type of change