Be sure to answer all parts. When powdered zinc is heated with sulfur, a violent reaction occurs, and zinc sulfide forms:
Zn(s) + Sg(s) → ZnS() (unbalanced]
(a) Some of the reactants also combine with oxygen in air to form zinc oxide and sulfur dioxide.
When 83.2 g of Zn reacts with 52.4 g of Sg, 109.3 g of ZnS forms. What is the percent yield of ZnS?
%
(b) If all the remaining reactants combine with oxygen, how many grams of each of the two oxides
form?
Mass Zno:
g
Mass SO2:

Adilute aqueous potassium nitrate solution is

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.

What is the molar mass of the anhydrous compound? answer using four significant figures. 36.02 g/mol 120.15 g/mol 156.12 g/mol