If brass is 25% (by weight) copper, how many grams of copper are in 12 grams of brass?

3 grams of copper because 25% of 12 is 3

The first step to solving this is understanding all of the important information and disregarding useless information. By doing this, we can see that we are looking for what 25% of 12 is.

The next step is setting up the expression and solving. To solve for a percent, we should multiply the number by the percent's decimal value, which is the percent placed over 100. In this case, the percent's decimal value is .25, so the expression would be set as:

=12*.25
=3

Therefore, we know there are 3 grams of copper for 12 grams of brass.

will make an electrolytic solution

Explanation:

Electrolyte is a substance which dissociates into ions when dissolved in water and thus is able to conduct electric current through them.

Compounds in solid form does not conduct electricity due to the absence of free ions.

a) is a covalent compound and thus not an electrolyte.

b)  is a covalent compound and thus do not dissolve in water and thus is not an electrolyte.

c)  is an ionic compound and thus dissolve in water and give ions which help to conduct electricity.

d)  is a covalent compound and thus do not dissolve in water and thus is not an electrolyte.