Question

8. Hydrogen and oxygen gas combine to form water at STP. If you want 34.5 g of water how many L of oxygen would you need? 9. If the pressure exerted by a gas at 13.0°C in a volume of 0.890 L is 4.52 atm, how many moles of the gas are present? 10. A sample of fluorine gas has a pressure of 6.85 mmHg at 10.0'C. What will its pressure be at 35.0*C if its volume remains constant? 11. A 550. mL sample of gas has a mass of 8.36 g, at 27°C and 216 kPa. What is the molar mass of the substance? STUDIOArt Composition Book - 9.75 in x 75 in (24.765 cm x 19.05 cm) 100 Sheets - College Ruled -6922

Answer 1

Auguer: 6 2H₂ + O2 → 2H₂O AT STP ; P= 1 atm ; T = 273k 10.00) moles of tho= mass = 34.59 = 1.92mal mdar men 18gn Now mores of O2 = 1 x money of H₂0 = { x 1.92 mol = 0.96 mol Volume of on; v= MRT o mares n= RT = 0.96 me xo.082) Loodamer/kX = 2736 latm = 21.5L laugwal PU 4.52 atm x 0. ggol 0.082) Latm mert klx 286k 0.171md langwe) volume and morex Uluga K- mg = Couplant 10 A -k. P = P2 Now PI= 6.85mming . Ti = 283k P2 ? ? ; T2 = 308k i P₂ = 6.85mmung x 3084 293 K 7. 45 mm neg laus wa). P= 216 k baz q:13 atm ; V- O.SSOL; T= 300K(27°c) ... na PU = 2.13 atm x o SSOL RT 0.0821 Latm mellklx 3ook = 0.0476 me) 0 molar mare of sample = marr mo) 8.369 = 0.0476 mol 175.63g met langwe