Question

Lithium hydrogen carbonate, LiHCO3, decomposes when heated to form Li2O, CO2, and H2O. How many moles of H2O are formed when 0.50 mol LiHCO3 decomposes?

Answer 1

Answer:

0.25 mol of water

Explanation:

The starting point is writing out a balanced chemical equation

$2LiHCO_{3} --->Li_{2}O +2CO_{2} +H_{2}O$

From here we can see that 2 moles of Lithium hydrogen carbonate produce 1 mole of water. It follows that 0.5 moles of Lithium hydrogen carbonate will produce half of that too, which is 0.25 moles. The ratio is always mantained.