How many mole are in 2.84*10^22 molecules of h2

What is the formula that this ionic compounds could form sr2+p3-o2-

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

Iron (fe) reacts with copper sulfate (cuso4) to form iron (ii) sulfate. in this reaction, cu2+ gains electrons to form cu. which statement is true about this reaction? fe(s) + cuso4(aq) → feso4(aq) + cu(s)