Question

How many moles of water will be produced when 15.0 g of calcium chloride dihydrate are heated ?

Answer 1

Answer:

0.204 mol

Explanation:

Step 1: Write the balanced equation for the heating of calcium chloride dihydrate

CaCl₂.2H₂O ⇒ CaCl₂ + 2H₂O

Step 2: Calculate the moles of calcium chloride dihydrate

The molar mass of CaCl₂.2H₂O is 147.01 g/mol. The moles corresponding to 15.0 g of CaCl₂.2H₂O are:

$15.0g \times \frac{1mol}{147.01g} = 0.102 mol$

Step 3: Establish the molar ratio of CaCl₂.2H₂O to H₂O

According to the balanced equation, the molar ratio of CaCl₂.2H₂O to H₂O is 1:2.

Step 4: Use the molar ratio to calculate the moles of water produced from 0.102 moles of calcium chloride dihydrate

$0.102molCaCl_2.2H_2O \times \frac{2molH_2O}{1molCaCl_2.2H_2O} = 0.204molH_2O$