<Dl> <Dd> CrCl 6H O + 6 SOCl → CrCl + 6 SO + 12 HCl </Dd> </Dl> <Dd> CrCl 6H O + 6 SOCl → CrCl + 6 SO + 12 HCl </Dd> <P> The hydrated chlorides are prepared by treatment of chromate with hydrochloric acid and methanol . In laboratory the hydrates are usually prepared by dissolving the chromium metal or chromium (III) oxide in hydrochloric acid . </P> <P> Slow reaction rates are common with chromium (III) complexes . The low reactivity of the d Cr ion can be explained using crystal field theory . One way of opening CrCl up to substitution in solution is to reduce even a trace amount to CrCl, for example using zinc in hydrochloric acid . This chromium (II) compound undergoes substitution easily, and it can exchange electrons with CrCl via a chloride bridge, allowing all of the CrCl to react quickly . </P>

How many atoms are in one molecule of chromium (iii) chloride crcl3