consider the reaction: 2 Hag)-c)2(g) 2 H20(), which is the limiting reactant roo
ID: 699179 • Letter: C
Question
consider the reaction: 2 Hag)-c)2(g) 2 H20(), which is the limiting reactant roog Hz is combined with 96.0 g O2? Name2 This periodic t b. O INK. Yo c. H2O d. Neither data on this pay 12. Aluminum burns in air with a dazzling brilliance to produce aluminum oxide: 4 Al(s) + 3 O2(g) 2 Al2O3(s) ,0faluminum burns in air, 3.15 g of Al 20s are recovered. What is the percent yield of this reaction? a. 100 % b, 83.4% c. 60.3 % d. 50.0 % .01 13. A sample of oxygen gas occupies a volume of Vi-826 mL at a pressure of P, 443 torr. What is the pressure of the gas (Ps in torr) if the volume is reduced at constant temperature to Vr 154 mL? a. 0.00042 torr b. 82.6 torr c. 238.0 torr d. 2380 torr 14. How many liters will 0.200 moles of CHs occupy at 200 °C and 760 tor? (assume ideal gas behavior) a. 8.1 mL b. 3.3 L c. 7.76L d. 22.4 L 15. According to the kinetic molecular theory of gases, which of the following gases will have the lowest average molecular speed at the same temperature? Assume ideal behavior. a. Ar b. CO c. HF d. All gases have the same average speed at the same temperature.Explanation / Answer
11)
2 H2 (g) + O2 (g) ----> 2 H2O (l)
2 moles of H2 produces 2 moles of H2O
2*2 g of H2 produces 2*18 g of H2O
9 g of H2 produces 2*18/2*2*9 g of H2O
= 81 g of H2O
2 H2 (g) + O2 (g) ----> 2 H2O (l)
1 mole of O2 produces 2 moles of H2O
32 g of O2 produces 2*18 g of H2O
96 g of O2 produces 2*18/32*96 g of H2O
= 108 g of H2O
so H2 produces least amount of H2O so it is limiting reagent.
Answer : A
12)
4 Al (s) + 3 O2 (g) -------> 2 Al2O3 (s)
4 moles of Al produces 2 moles of Al2O3
4 * 27 g of Al produces 2 * 102 g of Al2O3
2 g of Al produces 2*102/(4*27)*2 g of Al2O3
= 3.78 g
Percentage yield = 3.15/3.78*100 = 83.4%
Answer : B
13)
Accoriding to ideal gas equation,
P1V1 = P2V2 at constant temperature and number of moles,
P1 = initial pressure = 443 torr
P2 - final pressure = ?
V1 = initial volume = 826 mL
V2 = final volume = 154 mL
443 * 826 = P2 * 154
P2 = 2376.77 torr nearly equal to 2380 torr
Answer : d
14)
According to ideal gas equation PV = nRT
P = Pressure of the gas = 760 torr = 760torr/760torr/atm = 1 atm
V = volume of the gas in L = ?
n = number of moles of gas = 0.2 moles
T = temperature of the gas = 200 )C = 200 + 273.15 = 473.15 K
R = universal gas constant = 0.0821 L atm/molK
1 * V = 0.2 * 0.0821 * 473.15
V = 7.769 L
Answer : C
15)
According to kinetic thoery of molecules average speeed of any gas is proportional to absolute temperature. so at samme temperature all gases have same average molecular speed.
Answer : d
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