Answer:
1.12 g CaCl₂
Explanation:
To find the mass of calcium chloride, you need to (1) convert grams KCl to moles KCl (via molar mass), then (2) convert moles KCl to moles CaCl₂ (via mole-to-mole ratio from equation coefficients), and then (3) convert moles CaCl₂ to grams CaCl₂ (via molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.
Molar Mass (KCl): 39.098 g/mol + 35.453 g/mol
Molar Mass (KCl): 74.551 g/mol
Molar Mass (CaCl₂): 40.078 g/mol + 2(35.453 g/mol)
Molar Mass (CaCl₂): 110.984 g/mol
1 CaCl₂(aq) + K₂CO₃(aq) -----> 2 KCl(aq) + CaCO₃(aq)
1.50 g KCl 1 mole 1 mole CaCl₂ 110.984 g
----------------- x ----------------- x ----------------------- x ------------------ =
74.551 g 2 moles KCl 1 mole
= 1.12 g CaCl₂
