20. Consider the following balanced equation: Ca(s) + 2 H,O(l) Ca(OH),(aq) + H,(
ID: 875763 • Letter: 2
Question
20. Consider the following balanced equation: Ca(s) + 2 H,O(l) Ca(OH),(aq) + H,(g)? If you perform this experiment in the lab and you produce 5.00 grams of calcium hydroxide from 10.0 grams of calcium, what is your percent yield? a. 13.5% [b1 27.0 % c. 50.0% d. 92.4% When silver (I) nitrate reacts with barium chloride, silver (I) chloride and barium nitrate are made. If you react 10.0 grams of silver (I) nitrate with 15.0 grams of barium chloride, how many grams of silver (1) chloride will be produced? (Hint: write down a balanced equation for the reaction)b N 21. 8.44 grams b. 9.40 grams c. 11.9 grams d. 18.8 grams 22. How many grams of AgNO, are needed to make 250 mL of a 0.135 M solution? a. 0.0917 grams b. 0.174 grams 5.73 grams d. 9.17 grams 23. How many milliliters of a 9.0 M H,SO, solution are needed to make 0.250 L of a .5 M H,SO, solution? a. 0.097 mL b. 0.64 m c. 97mL d. 640 mLExplanation / Answer
20. See 1st we will find out number of moles of Calcium = weight /molecular weight = 10/40 = 0.25 mole
Now the Experimental yield/Actual yield yield of Ca(OH)2 given is 5 g
But Theoritical/Calculated yield which should come out = number of moles of Ca x Molecular weight of Ca(OH)2
= 0.25 x 74 = 18.5 g
So % yield = Actual yield/Calculated yield = (5/18.5)x100 = 27.02 % so correct option is b
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