The balanced equation says ... for every 2 moles of HCl you will get 1 mole of CaCl2, that means for 7 moles of HCl, you will get 3.5 moles of CaCl2.
Now all you need to do is to convert the moles of CaCl2 to grams of CaCl2.
Remember moles = mass/molar mass
So mass of CaCl2 = Moles of CaCl2 X Molarmass of CaCl2
mass of CaCl2 = 3.5 mol X 110.9 g/mol = 388.15 g CaCl2