Final answer:
To calculate the number of moles of NiSO₄ in 2 mL of a 3 M solution, multiply the volume in liters (0.002 L) by the molarity (3 M), resulting in 0.006 moles of NiSO₄.
Step-by-step explanation:
The student has asked: "How many moles of NiSO₄ are in 2 mL of a 3 M solution of NiSO₄?" To determine the number of moles of NiSO₄ in a given volume of a solution, we use the definition of molarity, which is moles of solute per liter of solution. Since the molarity of the NiSO₄ solution is given as 3 M, this means there are 3 moles of NiSO₄ per liter of solution.
First, convert the volume from milliliters to liters: 2 mL = 0.002 L. Then, use the molarity to find the moles: Number of Moles = Molarity × Volume in Liters = 3 moles/L × 0.002 L = 0.006 moles of NiSO₄.
Therefore, there are 0.006 moles of NiSO₄ in 2 mL of a 3 M solution.