Incorrect R Incorrect Question 1 of 7 Map A sapling learning A sample of 5.02 g

Question

Incorrect R Incorrect Question 1 of 7 Map A sapling learning A sample of 5.02 g of solid calcium hydroxide is added to 27.5 mL of 0.280 M aqueous hydrochloric acid Enter the balanced chemical equation for the reaction. Physical states are optional and not graded Tip: If you need to clear your work and reset the equation, click the button that looks like two arrows. What is the limiting reactant? O calcium hydroxide O hydrochloric acid How many grams of salt are formed after the reaction is complete? Number How many grams of the excess reactant remain after the reaction is complete? Number Previous Check Answer Next Exit Hint

Explanation / Answer

a)

Ca(OH)2 + 2HCl = CaCl2 + 2H2O

b)

Ca(OH)2 = 5.02 g

MW Ca(OH)2 = 74.093

mol = mass/MW = 5.02/74.093 = 0.0677 mol Ca(OH)2

V = 27.5 ml M = 0.28 M HCl

mol = MV = 27.5*0.28/1000 = 0.0077 mol of HCl

HCl is limiting

c)

CaCl2 = ?

mol of HCl = 1/2 mol o FCaCl2

then

mol of Hcl = 0.0077

mol of CaCl2 = 0.0077/2 = 0.00385 mol of CaCl2

mass = mol*MW = 0.00385*110.98 = 0.427273 g of CaCl2

d)

mass left of excesS?

mol of Ca(OH)2 = 0.0677 -0.0077/2 = 0.06385 mol of Ca(OH)" =

mass = mol*MW = 0.06385*74.093 = 4.730g left

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