is one correet answer for each quest ing questions by eireling the letter of you

Question

is one correet answer for each quest ing questions by eireling the letter of your answer. There 1. Which of the following gas samples would be most likely to behave ideally under the stated conditions? A) Ar at STP B) CO at 200 atm and 25°C C) SO2 at 2 atm and 0 K D) N2 at 1 atm and-70°C E) H2 at 400 atm and 25 C 2. Which of the following samples will have the greatest average speed at 355 K? A) Kr B) C2Hs C) Cl2 D) CH E) All of these samples will have the same average speed. 3. A balloon filled with hel lium gas at 20°C occupies 4.91 L at 1.00 atm. The balloon is immersed in liquid nitrogen at -196°C, while the pressure is raised to 5.20 atm. What is the volume of the balloon in the liquid nitrogen? A) 0.25 L B) 3.6 L C) 6.7 L D) 97 L 4. How many grams of F2 gas are there in a 5.00-L cylinder at 4.00 x 103 mm Hg and 23°C A) 19.5 g B)41.1 g C) 500 g D) 2.96 x 104 g

Explanation / Answer

1.

Answer is option (A)

Since ideal gases behave ideally at STP, and argon (Ar) is a noble gas so it's almost ideal anyway.

2.

Answer is option (E)

All of the samples will have the same average kinetic energy at the same temperature.

3.

We know that

P1V1/T1 = P2V2/T2

Or, V2 = ( P1 V1 T2 ) / ( T1 P2)

T1 = 20 oC = (273 + 20)K = 293 K
V1 = 4.91 L
P1 = 1.00 atm

T2 = - 196 oC = (273 - 196)K = 77 K
V2 = ?L
P2 = 5.20 atm

Substituing the values, we get

V2 = ( P1 V1 T2 ) / ( T1 P2)
Or, V2 = { (1.00 atm) x (4.91 L) x (77 K) } / { (293 K) x (5.20 atm) }

Or, V2 = 0.25 L

4.

We know that

PV = nRT

Or, n = PV/RT

V = 5 L

P = 4.00 x 103 mm Hg = 4000 mm Hg

T = 23 oC = (273 + 23) K = 300 K

R = 62.36367 L·mmHg·K-1·mol-1

Substituting the values, we get;

n = PV/RT
   = [ (4000 mmHg) x (5 L) ] / [ (62.36367 L·mmHg·K-1·mol-1) x (300 K) ]
   = 1.07 mol

Molar mass of F2 = 38 g/mol

So, 1 mol of F2 = 38 g
or, 1.07 mol of F2 = 1.07 x 38 g = 40.66 g

So, Answer is option (B) 41.1 g

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