In a certain area of ​​the apparatus, where the pressure is 1 atm and the temperature is 200 ° C, the analysis of the gas is 33.33% NH 3 (A), 16.67% N 2 (B), and 50% H 2 (C) by volume. The conditions are such that the ammonia diffuses from the gas stream to the catalyst surface; also the Reaction products diffuse in the opposite direction, as if there were molecular diffusion to through a 1 mm thick gaseous film under a laminar regime.

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Which statement can best be concluded from the ideal gas law?

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.)