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# Need help with Stoichiometry question. watch

1. Calcium reacts with water as shown. Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g) What is the total mass of the solution that remains when 40 g of calcium reacts with 100 g of water?
A 58g B 74g C 138g D 140g
2. (Original post by waleed99)
Calcium reacts with water as shown. Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g) What is the total mass of the solution that remains when 40 g of calcium reacts with 100 g of water?
A 58g B 74g C 138g D 140g
1) convert the amounts of calcium and water into their respective moles

2) figure out which of the two is the limiting reactant

3) use the moles of the limiting reactant to determine the moles of calcium hydroxide solution formed

4) convert the moles of calcium hydroxide to mass

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