If 1.65 g of Cu(NO_3)_2 are obtained from allowing 0.93 g of Cu to react with excess HNO3, what is the percent yield of the reaction? (Mw of Cu(NO_3)_2 = 187.56 g/mol, Mw of Cu = 63, 546 g/mol)Cu (s) + 2HNO_3 (aq) --> Cu(NO_3)_2 (aq) + H_2(g)(a) 60%(b) 70%(c) 93%

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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.

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %