Question

19. Calculate the rate of flow of O, (g) through the walls of a porous tube if H, (g) flows at the rate of 3.95 x 10 mL/sec under identical conditions. 20. Acetylene gas reacts with oxygen gas as follows: 2 C,H, (B)+5 0, (8) 4 CO, (B) +2 H,0 (g) What quantity of CO, (g) is formed when 6.0 L of acetylene gas is completely combusted? 21. How many liters of O,(g) at STP are evolved when 3.25 g of KNO,(s) decomposes to KNO,(s) and O,(g)? 22. A mixture containing 0.250 mol N, (g), 0.150 mol CH, (g), and 0.100 mol O, (g) is confined in a 1.00 L vessel at 35° C Calculate the partial pressure of O, (g) in the mixture. b. Calculate the total pressure of the mixture. а. If the temperature is raised to 50° C, what is the new partial pressure of O, (g), its mole fraction, and its percentage in the gas mixture? c. 23. The Space Shuttle uses aluminum metal and ammonium perchlorate in its reusable booster rockets. The products of the reaction are aluminum oxide, aluminum chloride, nitrogen oxide gas, and steam. The reaction mixture contains 7.00 g of aluminum and 9.32 g of ammonium perchlorate. a. Write a balanced equation for the reaction. b. What is the theoretical yield, in grams, of aluminum oxide? c. If 1.56 g of aluminum oxide is formed, what is the percent yield? d. Assuming a 100 % yield , how many grams of excess reactant are unused? 24. A piece of dry ice (CO, (s)) has a mass of 22.50 g. It is dropped into an evacuated 2.50 L flask. What is the pressure in the flask at -4°C? 25. Which of the following are redox reactions? Identify the oxidizing and reducing agents, if present. HBr (g)+ H,O (I)H,0 (aq) + Br (aq) b. 2 Fe (aq) H,0, (aq) 2 Fe (aq) + 2 OH (aq) c. Fe (aq)+ 2 OH (aq) Fe(OH), (s) d. 2 CH,OH (I)+3 0, (g)2 CO, (B)+4 H,0 (I) e. N, (g)+3 H, (g)2 NH, (g) f. CO (g)+H,O (g)co, (B)+ H, (8) g CO, (g)+2 H20 (I) H,0 (aq)+HCO, (aq) h. Cus (s)+O, (g) Cu (s)+ So, (g) i. 2 AgNO, (aq) + Cu (s) Cu(NO,), (aq) + 2 Ag (s) j. 2 AgNO, (aq)+ Na,So, (aq) 2 Na NO, (aq) + Ag,So, (s) а. 26. Cyclopropane mixed in the proper ratio with oxygen can be used as an anesthetic. At 755 mm Hg and 25°C, it has a density of 1.71 g/L. a. What is the molar mass of cyclopropane? b. Cyclopropane is made up of 85.7 % C and 14.3 % H. What is the molecular formula of cyclopropane?

Answer 1

Ans 19 Ginahann's law of Diffusion | Effusion According to this law rate of diffusion / effusion of different gases auc inversely proportional to the equame soot of theiss clensities. M 7, = rate of diffusion leffusion of gas I a = rate of diffusion/ offusion In teums of molecular Mass of goja. | Here, density is mais per ml of the I god and vapowr dersity is mass of 11200 m2 of gas at STP. (Molecular Mass = 2x vapour Hence, valio of density of two gases i's equal to their Vapour densities 1 Given data W = 3.95 x 10-ml I sec. von = ? UM density 3.958103 ml/sec. 32 g mo I molt ✓ gmolt Moon 3-9581079 m / sec. Tous = 0.9875 X10-9 ml I sec. mog 9.875 X104 mL/ sec.

Any Acetylene, reacts with Oxygen as follows – 2 CH2 Cg? + 50, (g) → 460,92 + H2O cg) (2 vol.) (5 vol.) (4 vol.) (2 vol.) According to Gray Lussac's law of gaseous volumes. 22 of Cate reacts with SL og to form 4L cog (at STP) 62 of Calle reacts with a to form coa = 4 2 6 of los = 122 of coe Hence, 12 l of cos is formed when 6L of acetylene gas is completely combusted. Any e Decomposition Heaction of KNOG - 2KNO(s) > &KNO, (s) + Molay 2x101.10 9) Мам = 24 2- 3 According to the above equation - 101.10g of kng produces 22.44 De at ste 3.25g of lenog will produce o = 22.4x3.25 L of og 202.10 = 0.3600 L goed Hence, volume of a produced when 3.25g of KNO is decomposed is 0.3600L of 89.

Ans. 2. Moles of Ng (n) = 0.25 mol nog = 0.100 mol netty = 0.150 mol. @ Portial pressure of Oz = ? T= 35°C - 35+273k = 308K V=12 R = 0.0821 atmL k'mort Por = 0.100 mal X 0.0821 almL let molt x 308K IL = 2.5286 am Por 2:53 ato © Protal = ? Ptotal = Pret Pol + Perly RD + My RT + Memy PT - Count 10 a mon) RT 0-250 + 0.100 0.150 ) X 0.0821 atm ktmol x 30815 1L

Protal Ptotal = = 0.5 x 0.0821X308 12.6434 atm T- = 5D + 2+3 = 323 K Psy - me. RT = 0.100 mol x0.0821 atmLki molt x 323k -loo mol xo.0621 am l xe" molt x 323k 1L I Pog = 2.65 am | new pantial pressure When temperature is raised to 506 of Og is 2.65 alm. Mole fraction of a (nog) = ? na t = nog (nog+n Ng + More) 0-100 (0.100+ 0.250 +0.150 0.100 = 0.2 I CH 1% = 0.2 Mole of Maction of Of is 0.2 Percentage in the gas mixture 20% Note: Mole function of all the components of mixture when added together will be 17