Explaination needed for Stoichiometric problem and is Al salt colorless?

[yeahyeah<3]

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 :)

 

[mgb_phys]

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!

 

[Blueshift5]

A stoichiometric problem involves determining the quantitative relationship between reactants and products in a chemical reaction. This includes calculating the amount of each substance involved, based on their respective atomic weights, to ensure that all elements are accounted for and no excess or insufficient amounts remain. In the given problem, the atomic weight of element Q can be determined by dividing the mass of Q in each compound by the number of moles of that compound. The resulting values should be similar and close to the atomic weight of Q.

As for the color of the Al salt, it is not possible to determine based on the given information. The color of a salt depends on various factors such as the oxidation state of the metal, the anion present, and the crystal structure of the salt. Without knowing these factors, it is not possible to accurately determine the color of the Al salt. Therefore, the statement that the solution is colorless does not provide enough information to identify the salt of Al.