Question

how many grams Ca(oh)2 from Ca(OH)2 + 2HCl = CaCl2 + 2H2O given 45 g H2O

Answer 1

Answer on Question #42604, Chemistry, Inorganic Chemistry

Question:

how many grams Ca(OH)₂ from Ca(OH)₂ + 2HCl = CaCl₂ + 2H₂O given 45 g H₂O

Solution:

We need to find the amount of substance of water:

$$\mathrm{N}(\mathrm{H_2O})(\text{mole}) = 45/18 = 2.5;$$

From the reaction equation we can see, that the amount of Ca(OH)₂ is equal to the half of water amount:

$$\mathrm{N}(\mathrm{Ca(OH)_2})(\text{mole}) = 2.5/2 = 1.25;$$

Now we can calculate the mass of Ca(OH)₂:

$$\mathrm{M}(\mathrm{Ca(OH)_2}) = 1.25*74 = 92.5$$

Answer: 92.5

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