Which one of these samples contains the smallest number of molecule? A) 1.0L of H2 at STP(0c and 1atm)
B) 1.0L of N2 at STP.
C) 1.0 L of H2at 20 c and 760 torr.
D) 1.0L of N2 at 0c and 800 torr.
E) 1.0 L of He at STP

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24

yes the answer is total mass in unchanged   : )