Question

8. i) How many moles of Neon gas will occupy a container with a volume of 2.5 L at a temperature of 31.5°C and a pressure of 912 torr? ii) What is the density of the gas? 9. A tank of compressed mixed gases contains 0.40 moles of Hz (hydrogen), 1.3 moles of NO2 (nitrogen dioxide), and 0.80 moles of Ar (argon). The total pressure in the tank is 2.8 atm. What is the partial pressure of the Hz gas? 10. If 16.8 L of carbon dioxide gas is produced at STP in the following reaction, how many grams of methane (CH) were burned? CH. (g) + 2O2(g) → CO2 (s) + 2 H20 (8) 11. In a reaction 18.5 L of iodine gas (12) are produced at STP according to the following chemical reaction: 2 Ki (aq) + Clz (8) ► 2 KCI (aq) + 12 () 1. How many moles of 12 are produced? ii. How many moles of Kl were used? iii. How many grams of Kl were used? 12. Hydrogen gas was produced in a reaction when 112.5 grams of solid aluminum reacted with HCl at STP. 2 Al (s) + 6 HCl (aq) → 2 AlCl3 (aq) + 3 H2 (g) i. How many moles of Al reacted? ii. How many moles of H2 are produced? ill. How many liters of H2 are produced? 13. If 16.8 L of methane gas is completely combusted at 730 mm Hg and 20°C in the following reaction, how many grams of water are produced? CH, (g) + 2O2 (g) → CO2 (g) + 2 H20 (g) 14. In a reaction 1.50 L of hydrogen gas was collected over water at 25°C and 725.0 mmHg when aluminum metal was reacted with hydrochloric acid. Calculate the mass of aluminum used in the reaction, assuming that Al completely reacted. The pressure of water vapor at 25°C is 23.8 mmHg. 2Al(s) + 6HCl (aq) → 2AlCl3 (aq) + 3H2 (8) 15. How much faster will hydrogen effuse as compared to nitrogen gas? 16. Helium effuses 3.16 times faster than a noble gas. Which noble gas can it be?

Answer 1

PAGE NO. DATE: / 1 Ans 8. j Ideal Gas Equation PV = nRT V- 2.5h T-315+273 = 304-5. K. P= 912 torr = 1,2 atm. R = 0,0821 hatm/mol k. Putting values weget, pu RT 1.2 X 2,5 0,0821 X 304.5 In: 0.12 moles fm molar mas RT i density 1.2X 20 000821 X zous dersity = 9,96g/L 9. Baltan's hauen Partial pressure. Total Pressure & molefracti the line 0.40 +1.3 +0.8 -0.16 2 TIL

PAGE NO DATE: 2.8× 0,16 Partial pressure (12) 0.448 atm 10. Chhelg) + 202 (g) conly) + 2400g) At STP, 22.42 is equal to Imole will be 0.75 moles co Imole chy Imole (or 0.75 moles of Chy will be used. Mals > 0.75 X 16 - 12 grame 2KI + Ch (g) zka fan) + Iz lg ) At STP, 22.4L occupied by Imoll. 18.5L will be occupied by » 18.5 22,4 = 0.8259 moly ! i moles of I = 0.82.59 moles is amole K I gives Imole I. i moles y les meet = ** 018254 = 7.651 GO TIL

PAGE NO.: DATE: 1 1669 1 mal. ii KI molar mast: ... malsa 1.651 X166 274.2g 9) 12. 2 Alls) + 6 46199) 2 All laq) + 3H2(g) 1 mass 112.5 YA moles you 112.5 27 4.16 moles al i zmole Al produce 3 mol na is 4el6mole will produce x 3 xhilf 6.25 moles the ci At STP Imol = 22,4 L i Total volume 2204 X 6.25 = 1404 TIL

PAGE NO.: DATE: 1 1 CO (g) + 242019). 13. chu(g) + 20, 19) moles of methane PV RT 730 760 X 16.8 010821 x 293 moles = 0.67 moles Imole ny - 2 mole lo moles of no produced - 0167X2 - 1.34 moles mols of the 134 x 18 = 24,124. 2 ALLS) + bucl 29) => 2 Ally laq) +341219) motes of that X 1.50 Pressure of th=725 14. 701. 2 760 0.0821 X 298 -23.8 = 70102 moleef oork. TIL

DATE / 2 mole at produces zmoll uza 0.056 mol ₂ will require a 2 x 0.056. = 0.037moles al moles of ne 0.037 mass of Al= Od 037 x 27 o.999 grams 15 Rate of Effusion & 1 ✓mm. Rnz RN2 MM NZ MM na 28 Ref Row 2 Rua - VIY RN Ilth = 3,74 RN) A n will effus 3.74 times more faster as compared to Ne

16. Rate of effusion a where, mm= molar mass mm = 316= Ruz Rize S x ay k= = 39.9.g/mol n is Argon (Ar)