Can some1 solve these Molarity questions????

Question

Find the Molarity of the following

1. 2.5 grams of NaOH in 1 Liter.

2. 25 grams of HCl in 250 mL

3. 10 grams of KOH in 5 Liters

4. 4.5 grams of CaCl2 in 125 mL.

5. 30 grams of NH4OH in 2 Liters

6. 10 grams of MgCl2 in 1 Liter

7. 15 grams of NaCl in 100 mL

8. 5 grams of Calcium in 1 Liter

9. 20 grams of KI in 500 mL

10. 2 grams of CaSO4 in 2 Liters.

Answer 1

All of these are done in the same manner; you need to calculate the weight of 1 mole of the compound listed (in GRAMS!), determine what portion of a mole the given weight corresponds to, then divide by the volume (in LITERS!)

I will do one as an example, there is no reason why you can't do the rest of your homework!

4.5 g CaCl2 in 125ml

125ml x 1 liter/1000ml = 0.125 liter

1 mole CaCl2 weighs [40.08 +(2 x 35.45)]g = 110.98g ~111g

4.5g/111g/mol = 0.0405 moles

Molarity is: 0.0405mole/0.125L = 0.324M