E) Application of sufficient pressure to carbon dioxide gas QWll Fise if the air
ID: 556511 • Letter: E
Question
E) Application of sufficient pressure to carbon dioxide gas QWll Fise if the air in it is heated. produces solid dry ice. gas have to be changed to if the pressure is initially 3.50 taY 22.0°C AT-1260 B) 11.00 C)44.0°C. D)748°C E)-148 Of gas in a rigid container (no change in volume), what temperature will the and the desired final pressure is L.75 atm? 11. Calculate the number of moles and the mass of gas in 3.40 L ofHe at A) B) C) 0.152 mol, 0.608 g 76.2 mol, 305 g 0.152 mol, 0.0379 g 3.40 L of He at STP 76.2 mol, 19.0g 1.00 mol, 4.00 g D) E) 12·The two balloons shown in the figure each have the same volume, temperature, and pressure. Which of the following statements regarding the two balloons is A) The CO2 balloon has fewer molecules B) The density of the O2 balloon is greater C) The mass of the O2 balloon is greater than D) correet? than the O2 balloon. CO than the density of the CO2 balloon. the mass of the CO2 balloon. The CO2 balloon is more buoyant than the O2 balloon. None of these statements is correct. E) 13. The number of molecules in equal volumes of two different gases under the same condir temperature and pressure are A) widely different. B) extremely numerous C) impossible to compare without specific data. D) equal. E) greater for the molecule with the greater molar mass. greatest molar volur 14. Under which conditions does sulfur trioxide (SO3) have the A) B) C) D) E) high temperature and low pressure low temperature and high pressure high temperature and high pressure low temperature and low pressure The molar volume is always 22.414 LExplanation / Answer
10.
Formula,
P1 / T1 = P2 / T2
3.50 / 295.15 = 1.75 / T2
T2 = 147.58 K
t2 = -125.58 0C
t2 = - 126 0C
(A)
11.
Formula,
P V = n R T
1.00 * 3.40 = n * 0.0821 * 273.15
n = number of moles = 0.152 mol
Mass of He = 0.152 * 4.00 = 0.606 g.
(A)
13.
According to Avagadro's law,
At same temperature and pressure, equal volumes of gases have equal number of moles.
(D)
14.
High temperature and low pressure.
(A)
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