Gchem

[keliao]

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Iron reacts with element X to form the compounds FeX and Fe3X2.
When copper reacts with element X,the expected compound should be:


asnwer is E.
so we know that Fe forms the +3 and +2 ion. the fact that it reacts with X to form FeX ad Fe3X2 suggests that X forms an anion with a -3 charge. X^3- reacts with the Fe3+ ion to form FeX, since both have a -3 charge, but reacts iwtwith the Fe2+ ion to form Fe3X2 to balance the charge. Copper ususally forms either the +1 or the +2 ion. when the former reacts with X, the, There must be three Cu+ to balance the charge, resulting in Cu3X. when the latter reacts with X, it does so in the same way tha the Fe2+ ion does, forming Cu3X2.

i dont get it......
is it possible to result : CuX and CuX2??
how on earth would you know X is 3?? so do ou just add all the Cu ions (+1 and +2 = +3)?????????........

 

[supraman]

You might be overthinking this. Since X forms the 3 anion, and Cu can ionize into the +1 and +2 Cation, then reaction forms Cu3X and Cu3X2. I might not be getting your question though...ha

 

[harrygt]

Iron reacts with element X to form the compounds FeX and Fe3X2.
When copper reacts with element X,the expected compound should be:

View attachment 11160
asnwer is E.
so we know that Fe forms the +3 and +2 ion. the fact that it reacts with X to form FeX ad Fe3X2 suggests that X forms an anion with a -3 charge. X^3- reacts with the Fe3+ ion to form FeX, since both have a -3 charge, but reacts iwtwith the Fe2+ ion to form Fe3X2 to balance the charge. Copper ususally forms either the +1 or the +2 ion. when the former reacts with X, the, There must be three Cu+ to balance the charge, resulting in Cu3X. when the latter reacts with X, it does so in the same way tha the Fe2+ ion does, forming Cu3X2.

i dont get it......
is it possible to result : CuX and CuX2??
how on earth would you know X is 3?? so do ou just add all the Cu ions (+1 and +2 = +3)?????????........

You always flip numbers when you want to find out the compound's formula. Fe3X2 ---> Fe = +2 X = -3
Now, we know Cu can be either +1 or +2. Flip them with X's number and you get Cu3X and Cu3X2.