1. 4.5 × 1023 molecules of PCl5 contains how many moles of phosphorous?

    

   4.5

    

   0.75

    

   4.5 × 1023

    

   3.7 × 1023

    

   3.7

State how many moles are present in the following
samples.
(a) 1.33 1026 molecules of Br2
(b) 7.71 1026 molecules of C5H12
(c) 2.34 1023 molecules of B2H6
(d) 7.76 1023 atoms of Ne

12.25
What volume will each of the following occupy at STP?

(a) 5.37 × 1023 molecules of CO2
Volume of CO2= L

(b) 4.5 mol CH4
Volume of CH4= L

(c) 22.5 g oxygen
Volume of oxygen= L