Someone know how to solve for moles of !

Answer = 4.5

Rationale:

the element Mg comes with a 2+ ion and NO3 comes with -1 ion thus 3 * 1.5 M = 4.5 basically look up what mg ion is on google and it says mg+2 and no3 ion no3- im assuming you cant though so look at the formula.

Mg(NO3)2, mg gave 2 to NO3 but where is mg's number? its 1 so 2+1 = 3

* # M = ans

i think it is true since you can test the answer and can use observations to complete it.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.