An element is said to be enriched with respect to a particular isotope if it has an unnaturally large abundance of that isotope. consider a sample of cl2 that is enriched with 35ci 35c1 mass = 34.97 amu abundance = 85.00 % 37c1 mass = 36.97 amu abundance = 15.00 % (a) calculate the atomic weight of the enriched cl (b) how many cl2 molecules are in a 0.345 g sample of the enriched chlorine?

Which of the following pressures is equal to 760 mm hg? 2.0 atm 101.3 pa 101,300 kpa 101,300 pa

The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)