Did i actually do this chemistry problem right??? if I did yay but if not what did I do wrong... heres the?

Question

question

What is the molarity of a solution made by dissolving 7.50 grams of Mg(NO3)2 in H2O to make 25.0 mL of the solution?

What is the nitratie ion?

okay first here is what I did

7.50 grams of Mg(NO3)2 x (1 mol Mg(NO3)2)/ 148.33 grams Mg(NO3)2= .05056293 mol of Mg(NO3)2

and then I took

Molarity=moles of solute/liters

soo M of Mg(NO3)2= .0505 Moles of Mg(NO3)2 / .025

omg did I actually do a probem right if I did I will be so happy!!! But if not what did I do wrong :(?

Answer 1

Correct, don't forget units though.

Answer 2

Looks good, but in the last line, don't forget the unit of liters in the denominator.  NO3- ion is nitrogen in its highest oxidation state.  Nitric acid is a powerful acud and an industrially important chemical.   Nitrates occur in the natural nitrogen cycle.