Question

How many grams of CaCl2 are in 250 mL of 2.0 M CaCl2?

Answer 1

How many moles of KNO3 are in 500 mL of 2.0 M KNO3?

1 mol KNO3

How many grams of CaCl2 are in 250 mL of 2.0 M CaCl2?

55 g CaCl2

What volume of a 6.67 M NaCl solution contains 3.12 mol NaCl? 0.468 L

Answer 2

In order to figure out how many grams of CaCl2 are contained in a liter, we must first consider how many grams are contained in a mole.
How many grams is 1 mole of CaCl2?
1 mole of CaCl2 is 1 mole of Ca and 2 moles of Cl
1 mole of Ca weighs 40 g, and 2 moles of Cl weighs roughly 35x2=70 grams.
Therefore, 1 mole of CaCl2 weighs about 110 grams. Consult a periodic table for more precise numbers (weight of 1 mole is the atomic mass).

There are 2 moles of CaCl2 per liter, so 1 liter contains 110 x 2 = 220 grams of CaCl2.
220grams/Liter * .250L = 55g/liter