Respuesta :

maacastrobr

Answer:

11.58 g

Explanation:

  • CaO + H₂O→ Ca(OH)₂

First we convert the given masses of both reactants into moles, using their respective molar masses:

  • 6.89 g CaO ÷ 56 g/mol = 0.123 mol CaO
  • 13.79 g H₂O ÷ 18 g/mol = 0.766 mol H₂O

As 1 H₂O mol reacts completely with 1 CaO mol, and there are more H₂O moles than CaO moles, water is the non limiting reactant.

We calculate the mass of the reacting moles of water (the same number of CaO moles, 0.123):

  • 0.123 mol H₂O * 18 g/mol = 2.21 g

Finally we calculate how many grams of water remained after the reaction:

  • 13.79 g - 2.21 g = 11.58 g

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