Here's how to calculate the grams of CaCl2 from moles:

1. Find the molar mass of CaCl2:

* Ca (Calcium) has a molar mass of 40.08 g/mol

* Cl (Chlorine) has a molar mass of 35.45 g/mol

* CaCl2 has 1 Ca and 2 Cl atoms, so its molar mass is (40.08 g/mol) + 2*(35.45 g/mol) = 110.98 g/mol

2. Use the conversion factor:

* 1 mole CaCl2 = 110.98 grams CaCl2

3. Calculate the grams:

* 3.40 moles CaCl2 * (110.98 g CaCl2 / 1 mole CaCl2) = 377.33 grams CaCl2

Therefore, 3.40 moles of CaCl2 is equal to 377.33 grams of CaCl2.