# Problem: Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s) + H2O (I) → Ca(OH)2 (s) In a particular experiment, a 1.50-g sample of CaO is reacted with excess water and 1.48 g of Ca(OH)2 is recovered. What is the percent yield in this experiment? Select one: a. 99 b. 74.8c. 0.99 d. 101.2 e. 2.16

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88% (206 ratings)
###### FREE Expert Solution

We’re being asked to calculate the percent yield of Ca(OH)2 in the reaction of 1.50 g CaO with excess H2O. The balanced chemical equation is:

CaO(s) + H2O(l)  Ca(OH)2(s)

Recall that percent yield is given by: We know the reaction produced 1.48 g Ca(OH)2; this is the actual yield of the reaction. To calculate the theoretical yield, we need to do the following:

Mass of CaO (molar mass of CaO)  Moles of CaO (mole-to-mole comparison)  Moles of Ca(OH)2 (molar mass of Ca(OH)2)  Mass of Ca(OH)2

Since H2O is in excess, we can simply ignore it in our calculations.

88% (206 ratings) ###### Problem Details

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide:

CaO (s) + H2O (I) → Ca(OH)2 (s)

In a particular experiment, a 1.50-g sample of CaO is reacted with excess water and 1.48 g of Ca(OH)2 is recovered. What is the percent yield in this experiment? Select one:

a. 99

b. 74.8

c. 0.99

d. 101.2

e. 2.16

What scientific concept do you need to know in order to solve this problem?

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