How many moles of chlorine gas are associated with a #45*g# mass of the element?

1 Answer
anor277
Sep 20, 2016

A bit over a #1/2# mole of #Cl_2# gas.

Explanation:

All (well most) elemental gases are binuclear: i.e. #O_2#, #N_2#, #H_2#, #F_2#. The exceptions are the Noble Gases, which are unimolecular. In any case all the halogens (gas, liquid, and solid) are bimolecular, i.e. #X_2#.

#"Moles of stuff"# #=# #"Mass of stuff"/"Molar mass of stuff"# #=# #(45.12*cancelg)/(70.9*cancelg*mol^-1)#

#=# #>0.6*mol# #Cl_2# gas.

Note that you simply have to know that chlorine, and fluorine gases, and liquid bromine and solid iodine are BIMOLECULAR.

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