How many grams of AgCl will precipitate out if 0.27 mole CaCl 2 is reacted? CaCl 2 (aq) + 2 AgNO 3 (aq) 2 AgCl (s) + Ca(NO 3 ) 2 (aq)
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1 SAT Chemistry Problem Solving Drill 12: Stoichiometry Question No. 1 of 5 How many grams of will precipitate out if 0.27 mole is reacted? (aq) + 2 AgNO 3 (aq) 2 (s) + Ca(NO 3 ) 2 (aq) Question #01 A. 77 g B. 39 g C g D g A. Correct! Convert moles CaCl2 to moles using the balanced equation ratio and then convert moles to There are 2 molecules for every 1 CaCl2 molecules Convert moles CaCl2 to moles using the balanced equation ratio and then convert moles to Convert moles CaCl2 to moles using the balanced equation ratio and then convert moles to Known = 0.27 mole Unknown =? g Mole ratio: = 2 mole Molar mass: = g 0.27 mole 2 mole g = 77 g 77 is reasonable for grams g is the correct unit Answer = A. 77 g
2 Question No. 2 of 5 How many grams of Cl 2 is produced if 1.8 g is reacted? (s) + 2 (aq) Cl 2 (aq) + H 2 (g) Question #02 A g Cl 2 B. 4.4 g Cl 2 C. 7.1 g Cl 2 D. 14 g Cl 2 You have your molecular masses on the wrong sides of the ratios in the stoichiometry problem Convert grams to moles using molecular mass, then convert moles to moles Cl2 using the balanced equation and then convert back to grams Cl2 using its molecular mass. C. Correct! Convert grams to moles using molecular mass, then convert moles to moles Cl2 using the balanced equation and then convert back to grams Cl2 using its molecular mass. There s only of = Cl2 Known = 1.8 g Unknown =? g Cl 2 Mole ratio: = Cl 2 Molar mass: = g Molar mass: Cl 2 = g Cl g g Cl g Cl 2 Cl 2 = 7.1 g Cl is reasonable for grams g Cl 2 is the correct unit Answer: C. 7.1 g Cl 2
3 Question No. 3 of 5 How many liters of 0.55M are needed to react with 14.5 g? 2 (aq) + (s) (aq) + 2 H 2 O (l) Question #03 A L B L C L D L A. Correct! Convert grams to moles of Ca(OH)2 and then convert moles Ca(OH)2 to moles using the balanced equation. Then convert moles to liters There are 2 moles for each mole Ca(OH)2 Convert grams to moles of Ca(OH)2 and then convert moles Ca(OH)2 to moles using the balanced equation. Then convert moles to liters Convert grams to moles of Ca(OH)2 and then convert moles Ca(OH)2 to moles using the balanced equation. Then convert moles to liters Known = 14.5 g Unknown =? L Mole ratio: 2 mole = Molar mass: = g Molarity: 0.55 mole = 1 L 14.5 g 74.1 g 2 mole 1 L 0.55 mole = L is reasonable for liters (712 ml) L is the correct unit 3 sf given 3 sf in answer Answer: A L
4 Question No. 4 of 5 How many liters of gas is formed if 25.2 g decomposes? (s) H 2 O (l) + (g) Question #04 A L B L C L D L You have your molecular mass and your 22.4 in the wrong places in the ratios. You have your 22.4 in the wrong place in the ratio. There s only H2CO3 for CO2 D. Correct! Convert grams to moles H2CO3 using molecular mass. Then convert moles H2CO3 to moles to CO2 using the balanced equation. Convert moles CO2 to liters using 22.4 L = at STP. Known = 25.2 g Unknown =? L Definitions Mole ratio: = Molar mass: = g Molarity: = 22.4 L at STP 25.2 g g 9.10 is reasonable for liters L is the correct unit 3 sf given 3 sf in answer 22.4 L = 9.10 L Answer: D L
5 Question No. 5 of 5 How many grams of is produced with 15 g reacts with 15 g? 2 (aq) + (s) (aq) + 2 H 2 O (l) Question #05 A. 23 g B. 22 g C. 46 g D. 45 g this is one of the answers from the two stoichiometry problems but it s not the smallest answer B. Correct! Known = 15 g ; 15 g Unknown =? g Definitions Mole ratio: 2 mole = Molar ratio: = Molar mass: = g Molar mass: = g Molar mass: = g 15 g g g = 22 g 15 g g 2 mole g = 23 g 23 is reasonable for grams g is the correct unit Answer: B. 22 g
A. Correct. You successfully completed the stoichiometry problem. B. Incorrect. There are 2 moles of AgCl produced for each mole of CaCl 2 reacted.
MCAT General Chemistry Problem Drill 18: Stoichiometry Question No. 1 of 10 1. How many grams of AgCl will precipitate out if 0.27 mole is reacted? + 2 AgNO 3 2 AgCl + Ca(NO 3 ) 2 Question #01 (A) 77 g
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