Tiêu đề اسئلة-شابتر-5.pdf ✅

Chapter 5 ينلاسا نع ءايميكلا
 Questions : Q1. Which of the following gases has the greatest density at 2.5 atm and 25°C? (Molar masses for C= 12.0, H= 1.01, N= 14.0, O=16.0, S=32.1, and F= 19.0 g/mol) a) N2O b) SO2 c) C4H8 d) O2 e) NF3 Q2. If 318.0 mL of Nitrogen gas, measured at 488.9 mmHg and 22.3°C, reacts with excess iodine according to the following reaction, what mass of nitrogen triiodide (molar mass= 394.72) is produced? (1 atm= 760 mmHg and K= °C + 273) N2(g) + 3I2(s) → 2NI3(s) a) 3.33 g b) 4.33 g c) 13.30 g d) 20.0 g e) 6.65 g Q3. A mixture of gases contains 1.7 mol of N2 gas and 2.3 mol of Ar gas. If the total pressure of the mixture was 3.2 atm, what would be the partial pressure of N2 (in atm.)? a) 3.2 b) 1.6 C) 0.43 d) 1.4 e) 1.9 Q4. The average speed of nitrogen gas (N2, 28 g/mol) that effuses at 30.0 °C is 700 m/s. The average speed at which butene gas (C4H8, 56 g/mol) effuses at the same temperature is: a) 481 m/s b) 396 m/s c) 354 m/s d) 495 m/s e) 339 m/s Q5. A 0.564 gram of volatile liquid was vaporized at 92 °C and expanded in 250 ml flask at 755 mmHg. Calculate the molar mass of this liquid in g/mol. R = 0.082 atm.L/mol.K or 8.314 kg.m2 /s2 .K mol a) 78.1 b) 60.7 c) 68.1 d) 73.0 e) 84.9 Q6. Calculate the rms speed (in m/s) of F2 (molar mass = 38 g/mol) molecules in a cylinder at 27 °C and 8.7 atm. R = 0.082 atm.L/mol.K or 8.314 kg.m2 /s2 .K.mol a) 4.2 b) 132.0 c) 44.1 d) 13.9 e) 443.7 ينلاسا نع ءايميكلا
Q7. Given that 2.75 moles of H2O occupy 2.10 L at 147°C, calculate the pressure of the gas (in atm) using the van der Waals equation (p + aaaa22 vv22 )(v-nb) = nRT R =0.0821 aaaaaa.LL mmmm.KK , a=5.46 atm.L2 /mol2 , b= 0.0305L/mol a) 41.2 b) 33.4 c) 37.7 d) 29.8 e) 24.1 Q8. If it took 982 seconds for a sample of H2 (2.00 g/mol) to effuse, what would be the molar mass (in g/mol) for gas A if it requires 3670 s to effuse the same number of moles. The molar mass of A is: 22 11 = �MM22 MM11 a) 131.3 b) 20.2 c) 25.0 d) 98.9 e) 27.9 Q9. A sample of 0.00832 g an unknown gas has a volume of 250,0 mL. at a pressure 38.3 mmHg and a temperature of 22 °C. The unknown Compound is: a) SO2 (64.1 g/mol) b) N2O (44.0 g/mol) c) CH2O (30.0 g/mol) d) CH4 (16.0 g/mol) e) NO2 (46.0 g/mol) Q10. What is the density of Cl2 gas in g/L at STP (M.w= 70.90 g/mol., R = 0.0821 atm LK-1 mol-1, PV = nRT)? a) 1.43 b) 3.16 c) 1.25 d) 1.78 e) 0.900 Q11. A 0.590 gram of volatile liquid was vaporized at 96 °C and expanded in 200 ml flask at 800 mmHg. Calculate the molar mass of this liquid in g/mol. (R = 0.082 atm.L/mol.K or 8.314 kg.m2 /s2 .K.mol) a) 73.0 b) 78.1 c) 84.9 d) 68.1 e) 60.7 Q12.The molar volume of a gas (in L) at 300°C and 15 atm is: (R = 0.0821 L.atm/mol.K) a) 22.4 b) 3.1 c) 4.7 d) 1.9 ينلاسا نع ءايميكلا
Q13.For the following equation: C2H4(g) + 3O2(g) → 2CO2(g) +2H2O(g) Calculate the volume of C2H4(g) needed to react completely with 6.0 L of O2(g) a) 2.0 L b) 3.0 L c) 6.0 L d) 8.0 L e) 10.0 L Q14.Calculate the rms speed (in m/s) of Cl2 (molar mass = 71 g/mol) molecules in a cylinder at 27 °C and 8.7 atm. R = 0.082 atm.L/mol.K or 8.314 kg.m2 /s2 .K.mol a) 32.3 b) 3.1 c) 324.6 d) 96.4 e) 10.2 Q15.Which one of the following laws regarding gases is not correct? a) V2/V1 = n2/ n1 at constant T and P b) V2/V1 = P1/P2 at constant T and n c) PV = nRT d) V2/V1 = T1/T2 at constant P and n (T in kelvin) Q16.Consider the reaction below: 2Hg(g) + O2(g) → 2HgO(s) Hg and O2 gases were mixed in a 3.0 L container at 370.0 °C. If the pressure of Hg was 3.5 atm and the pressure of O2 was 2.5 atm. (Molar mass of HgO = 216.6 g/mol) [R = 8.314 J/mol.K = 0.0821 L.atm/mol.K], Calculate the mass of HgO produced? a) 58.5 g b) 73.8 g c) 30.8 g d) 43.1 g e) 615 g Q17. The vapor pressure of methanol (CH3OH) [Molar mass 32 g/mol) at 20 °C is 94 mmHg, and the vapor pressure of ethanol (C2H5OH) (molar mass 46 g/mol) at the same temperature is 44 mmHg. A mixture of 30.0 g of methanol and 45.0 g of ethanol is prepared.What is the mole fraction of methanol and ethanol in the vapor above this solution at 20°C ? a) methanol = 0.52 and ethanol = 0.48 b) methanol = 0.49 and ethanol = 0.51 c) methanol = 0.68 and ethanol = 0.32 d) methanol = 0.82 and ethanol = 0.18 ينلاسا نع ءايميكلا