Question 15 4 out of 4 points Starting with 156 g of salicylic acid a student

Question 15 4 out of 4 points starting with 156 g of

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Question 15 4 out of 4 pointsStarting with 1.56 g of salicylic acid, a student prepares 1.75 g of aspirin. If the calculated mass of aspirin is 1.88 g, what is the percent yield? Selected Answer:93.1%Answers: 121%93.1%89.1%107%83.0%Response Feedback: Percent yield = Actual yieldx 100% = 1.75 gx 100% = 93.1% Theoretical Yield 1.88 g Question 16 4 out of 4 pointsConsidering the limiting reactant concept, how many moles of copper(I) sulfide are produced from the reaction of 1.00 mol of copper and 1.00 mol of sulfur?
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2 Cu( s ) + S( s ) Cu 2 S( s ) S Question 17 0 out of 4 points What is the mass of silver metal produced from 6.35 g of copper? (You must balance the equation first)__Cu(s) + __AgNO3(aq) → __Cu(NO3)2(aq) + __Ag(s)
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= Question 18 0 out of 4 pointsWhat volume of oxygen gas reacts with 20.0 mL of hydrogen chloride? (Assume temperature and pressure remain constant.) (You must balance the equation first)__ HCl(g) + __O2(g) __Cl2(g) + __H2O(g ) 2
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Question 19 4 out of 4 pointsHow many moles of hydrogen gas are produced from 0.500 mol of water? (You must balance the equation first)__Ca(s) + __H2O(l) → __Ca(OH)2(aq) + __H2(g) Selected Answer:0.250 molAnswers: 0.250 mol0.500 mol1.00 mol2.00 molnone of the above Response Feedback: Ca( s ) +2 H 2 O( l ) → Ca(OH) 2 ( aq ) + H 2 ( g ) ? mol H 2 = 0.500 mol H 2 O x 1 mol H 2 = 0.250 mol H 2 2 mol H 2 O Question 20 4 out of 4 points What is the predicted product from the following combination reaction?Sr(s) + Br2(l) 2
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