Answer:
269 grams CuCl₂
Explanation:
To find the mass of CuCl₂ (copper (II) chloride), you need to (1) find moles CuCl₂ (via the molarity equation using the volume and molarity) and then (2) convert moles to grams (via the molar mass from the periodic table). The final answer should have 3 sig figs because the given number with the least amount of sig figs (4.00 mol/L) also has 3 sig figs.
(Step 1)
500.0 mL / 1,000 = 0.5000 L
Molarity (mol/L) = moles / volume (L)
4.00 mol/L = moles / 0.5000 L
(4.00 mol/L) x (0.5000 L) = moles
2.00 = moles
(Step 2)
Molar Mass (CuCl₂) = 63.546 g/mol + 2(35.45 g/mol)
Molar Mass (CuCl₂) = 134.446 g/mol
2.00 moles CuCl₂ 134.446 g
--------------------------- x --------------------- = 269 g CuCl₂
1 mole
