5. A rigid and sealed eylinder contains 0.250 mol of eliuam gas, 0,500 mol of ne

Question

5. A rigid and sealed eylinder contains 0.250 mol of eliuam gas, 0,500 mol of neon gas, and 0.150 mol of nitrogen gas. The total pressure inside the cylinder is 9.0 atm. Helium has a partial pressure of. 0.250 atm (B)0300 atm 61230 m0.250 50 atm () 5.00 atm 0.a0 2.52 2H2 (g) + O2 (g) 2H20 (g) 6. How many moles of osygen gas are need to produce 67.2L of Ho ()at STP in V the presence of excess hydrogen? (A) 3.0 mole 6.0 mole C))1.5 mole (D) 1.0 mole (B) 4.0 mole A gaseous solution contains 0.40 mol Ar, 1.20 mol He, and 0.40 mol Ne. the mole fraction of He in the mixture? What is 7. 1.20 mouO.o (A) 0.120 (B) 1.20 C) 0.333 b.60 0.80 8. A chemist places 2.5 moles of Ch (8) and 2.0 moles of HI () in a sealed 2.0 L vessel where the following reaction goes to completion at i5c T 2HI(g) + Cl2 (g) 2HCl (g) + 12 (s) Which of the following substitutions will give the value for the total pressure in the cylinder? A 3.5(0.0821X298) 2.0 4.5(0.0821)(298) 2.0 (e 4.500.082)25) K 2.0 3.5(8.3140298) 2.0 2.000.08210298) 2.0

Explanation / Answer

5)

pHe = mole of He*total pressure / total moles

= 0.250*9.0 atm / (0.250 + 0.500 + 0.150)

= 0.250*9.0 atm / (0.900)

= 2.50 atm

Answer: D

6)

moles of H2O = volume of H2O / molar volume

= 67.2 L / 22.4 L/mol

= 3 mol

from reaction,

moles of O2 = (1/2)*moles of H2O

= (1/2)*3 mol

= 1.5 mol

Answer: C

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