Did I calculate the molarity right?

Question

I just want this checked over before I have to mail it in and get it marked. If I'm wrong please tell me why!!

Calculate the molarity of the following solutions:

1. 250 mL of solution containing 25.0g of NaCL

Step 1: Convert to L = 0.25L

Step 2: molar mass of NaCl = 58.5 g

Step 3: number of moles of NaCl = 4.27 x 10^-1 mol NaCl

Step 4: molarity of NaCl= 1.709 M NaCl

2. 4.0 L of solution containing 2.8 mol of HNO3

Step 1: Already in L

Step 2 and 3: Already in moles

Step 4: 0.7 M HNO3

3. How many grams of CaCL2 are contained in 225 mL of 0.0350 M CaCl2?

Step 1: Convert to L = 0.225 L

Step 2: Calculate moles = 7.875 x 10^-3 mol CaCl2

Step 3: Molar mass = 111.1 g/mol CaCl2

Step 4: Mass of solute = 0.8749 g CaCl2

Thank you for your time!!

Answer 1

They're all correct. Make sure you follow the correct number of significant figures.

Answer 2

yea u should be right. only thing u could do wrong is plug it into a calculator wrong

Answer 3

Wow, this is hard..!

Answer 4

you are Correct.

Answer 5

you are right. men!