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

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:

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

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.