Need help with a few chemistry questions dealing with stoichiometry
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Need help with a few chemistry questions dealing with stoichiometry

[From: ] [author: ] [Date: 12-05-11] [Hit: ]
wt Al from bal. rxn., 2 moles Al react with HCl to form 2 moles AlCl3 (1:1) ? moles Al x molec. wt.......
I'm stuck on a these questions for chemistry

1. How many grams of Aluminum Chloride (AlCl3) are produced when 18 x 10^-3 grams of Aluminum (Al) are reacted with Hydrochloric Acid (HCl)

after balancing the equation I got

2Al(s) + 6HCl (l) --> 2AlCl3 (aq) + 3H2 (g)

I'm not sure what to do from here


Another one i'm stuck on is

2. How many molecules of Potassium Chloride (KCl) are formed by the decomposition of 0.6 million moles Potassium Chlorate (KCLO3)

The balanced equation is

2KClO3(s) ---> 2KCl (s) + 3O2 (g)

Can anyone help me out with these 2 questions? Thanks.

-
1. calc. moles of Al: 0.018 g Al/molec. wt Al
from bal. rxn., 2 moles Al react with HCl to form 2 moles AlCl3 (1:1)
? moles Al x molec. wt. AlCl3(g/mole)= ans.

2. from bal. rxn., 2 moles kCLo3 decomposes to form 2 moles of KCl (1:1)
therefore 0.6 million moles KClO3 form 0.6 million moles KCl
from avogadro's no. 6.02E23 molecules/mole
6.02E23 molecules/mole x 0.6E6 moles= 3.61E29 molecules
1
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