-AI(s) + _HCI(aq) AICI3(aq) +-H2(g) ? A) 1.12 L B) 1.49 L c) 2.24 L D) 3.36 L E)
ID: 705804 • Letter: #
Question
-AI(s) + _HCI(aq) AICI3(aq) +-H2(g) ? A) 1.12 L B) 1.49 L c) 2.24 L D) 3.36 L E) 6.72 L 5) What volume of oxygen gas reacts with 20.0 mL of hydrogen chloride? (Assume temperature and pressure remain constant.) HCI(9)+02(g) A) 5.00 mL B) 10.0 mL C) 20.0 mL D) 40.0 mL E) none of the above 6) What volume of oxygen gas reacts with 5.00 mL of methane, CH4? (Assume temperature and pressure remain constant.) CH4(s)+02()rkco2(s)+H20(s A) 2.50 mL B) 5.00 mL C) 10.0 mL D) 20.0 mL E) none of the above 7) Considering the limiting reactant concept, how many moles of copper(I) sulfide are produced from the reaction of 3.00 mol of copper and 1.00 mol of sulfur? 2 Cu(s) + S(s) Cu2S(s) -? A) 1.00 mol B) 1.50 mol c) 4.00 mol D) 6.00 mol E) none of the above 8) Starting 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?Explanation / Answer
5) let us take STP conditions.
1 mol = 22.4 L
20 ml HCl = 20*1/22.4 = 0.89 mmol
balanced equation = 4 HCl + O2 ----> 4Cl2 + 2 H2O
4 mol HCl = 1 mol O2
no of mol of O2 required = 0.89*1/4 = 0.2225 mmol
volume of O2 required = 0.2225*22.4 = 5 ml
answer: A
6) balanced equation: CH4 + O2 ---> CO2 + 2H2O
let us take STP conditions.
1 mol = 22.4 L
5 ML CH4 = 5/22.4 = 0.2232 mmol
no of mol of O2 required = 0.2232 mmol
volume of O2 required = 0.2232*22.4 = 5 ml
answer: B
7) from equation,
2 mol Cu = 1 mol S = 1 mol Cu2S
no of mol of Cu = 3 mol
no of mol of S = 1 mol
LIMITING REACTANT = S
no of mol of Cu2S formed = 1 mol
answer: A
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