Question
13. A lab assistant needs to make 500 mL of a 0.2 M solution of CuCl2 What mass of CuCl2 is needed to make the solution? Refer to the periodic table. a. 47.35g b. 35.55g c. 26.55g 13.45a
Answer
4
(266 Votes)
Clarice
Master · Tutor for 5 years
Answer
The mass of CuCl2 required to make the solution is 13.45g.
Explanation
## Step 1: We need to find out the moles of CuCl2 required for the solution. The formula to calculate moles is:### **Moles = Molarity x Volume in Liters**Given that the Molarity (M) is 0.2M and the Volume is 500 mL (which is equal to 0.5 L), we can substitute these values into the formula.## Step 2: Calculate the moles of CuCl2 using the formula:### **Moles of CuCl2 = 0.2M x 0.5L = 0.1 moles**## Step 3: Next, we need to convert moles to grams. We know that 1 mole of a substance is equal to its molecular mass in grams, also known as its molar mass. The molar mass of CuCl2 is calculated as:### **Molar mass of CuCl2 = (63.5 (for Cu) + 2x35.5 (for Cl)) g/mol = 134.5 g/mol**## Step 4: Finally, we can calculate the mass in grams by multiplying the moles of CuCl2 by the molar mass of CuCl2.### **Mass = Moles x Molar mass = 0.1 moles x 134.5 g/mol = 13.45 g**