A Student Dissolved 5

Multiple Choice

A student dissolved 5.00 g of Co(NO₃) ₂ in enough water to make 100.mL of stock solution.He took 4.00 mL of the stock solution and then diluted it with water to give 275.mL of a final solution.How many grams of NO₃^- ion are in the final solution?

A) 0.0247 g
B) 0.0493 g
C) 0.0678 g
D) 0.136 g