How many moles of chlorine gas are associated with a 45*g45⋅g mass of the element?

1 Answer
anor277
Sep 20, 2016

A bit over a 1/212 mole of Cl_2Cl2 gas.

Explanation:

All (well most) elemental gases are binuclear: i.e. O_2O2, N_2N2, H_2H2, F_2F2. The exceptions are the Noble Gases, which are unimolecular. In any case all the halogens (gas, liquid, and solid) are bimolecular, i.e. X_2X2.

"Moles of stuff"Moles of stuff == "Mass of stuff"/"Molar mass of stuff"Mass of stuffMolar 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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