Homework Help: chemistry

Posted by david on Saturday, February 23, 2008 at 6:42pm.

2Al+3Cl2=2AlCl3
calculate the amount(number) of excess reagen units remaining when 4.03x10^23 Al atoms and 6.42x10^23 Cl2 molecules react?

please help!!!!! thanks

chemistry - bobpursley, Saturday, February 23, 2008 at 7:47pm
For each Al, one needs 1.5 Cl2

So, one needs 1.5*4.03E23 or 6.045E23 Cl2.
Thus, there is an excess of Cl2.

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