Homework Help: chemistry

Posted by rose on Friday, February 22, 2013 at 1:47pm.

the mass of 2.50 mol of a compound with the formula ECl4, in which E is a nonmetallic element, is 385g. what is the molar mass of Ecl4? what is the identity of E?

chemistry - rose, Friday, February 22, 2013 at 1:48pm
sorry, sent it twicee
chemistry - Devron, Friday, February 22, 2013 at 1:59pm
molecular weight of Cl =35.4g

2.50 mol=385g of ECl4

This means that
1 mole of ECl4= (1/2.50)*385g= molecular weight of 1 mole of ECl4

molecular weight of 1 mole of ECl4-4(35.4g)= molar mass of E.

look up the identity in the periodic table.
chemistry - rose, Friday, February 22, 2013 at 2:28pm
thankks again!!1

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