NEED HELP...
Zn + 2AgCI —> ZnCI2 + 2Ag

1.) How many moles of ZnCI2 are obtained from the reaction of 2 moles of Zn?
A.0.5 mol
B.1.0 mol
C.1.5 mol
D.2.0 mol

2.) What is the mass of the excess reagent?
A.6.82 g
B.13.2 g
C.20 g
D.30 g

3.) What is the percent composition of sulfur in Na2SO4 ?
A.19%
B.23%
C.45%
D.33%

4.) An organic compound contains 57.1%C, 38%S, 4.9%H by mass. What is it's empirical formula?
A. CHS
B. C2H2S
C. C4H4S
D. C8H8S2

5.) What is the molecular formula of the compound in no. 18 if the molecular mass is 168 g?
A. CHS
B. C2H2S
C. C4H4S
D. C8H8S2

6.) Which among these compounds has the greatest oxygen composition?
A. NaOH
B. KOH
C. K3PO4
D. Na2SO4​