A) if the equilibrium concentration in the reaction 2no2 ⇌ n2o4 finds [n2o4]= 2.9x10-3 and [no2]= 4.2x10-3 find the equilibrium constant, k.
b) given k, if 0.100 m of no2 reacts, what will be the concentraitions when the reaction gets to equilibrium?
c) if to the equilibrium, from previous, we add 0.0500 m n2o4, calculate the equilibrium concentraitions. which direction did the reaction shift?

What problem would a person have if the nucleic acid in one of his or her cells were damaged?

1. list three scientific reasons cockroaches may fly.

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)