Explaination needed for Stoichiometric problem and is Al salt colorless?

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SUMMARY

The discussion centers on a stoichiometric problem involving the determination of the atomic weight of element Q based on its mass in four different compounds. The correct atomic weight is identified as 19.0 grams, as it is the only option that yields whole numbers when the compound masses are divided by it. Additionally, the colorless solution is confirmed to contain an aluminum (Al) salt, as all other options (Cu, Mn, Ni) are associated with distinct colors. The participants emphasize the importance of understanding the distinction between the mass of element Q and the total mass of the compounds.

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Homework Statement


The mass of element Q found in 1.00 mole of each of four different compounds is 38.0 grams, 57.0 grams, 76.0 grams, and 114 grams, respectively. A possible atomic weight of Q is

a) 12.7
b 19.0
c 27.5
d 38.0

A solution is known to contain an inorganic salt of one of the following

elements. The solution is colorless. The solution contains a salt of:

(A) Cu (B) Mn (C) Fe (D) Ni (E) AL

I do not know the answer to this. I know Cu is blue, Mn is pale pink, Ni is green, Co is redish and Al is silver white.


Homework Equations





The Attempt at a Solution

I know the answer is b. 19.0 grams. However, I'm not 100% sure how to get that answer. I know that it's the only one when the compound masses are divided by it you receive whole numbers. Is that how i was supposed to do the problem? That doesn't make sense to me because other elements could have been in the compound..


THANK YOU :)
 
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yeahyeah<3 said:

The Attempt at a Solution

I know the answer is b. 19.0 grams. However, I'm not 100% sure how to get that answer. I know that it's the only one when the compound masses are divided by it you receive whole numbers. Is that how i was supposed to do the problem? That doesn't make sense to me because other elements could have been in the compound..
Note that it says the mass of element Q in each sample - not the total mass of the sample!
 

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