Please answer all questions C 17.8°C D) 144°C 30. For an ideal gas, which pairs

Question

Please answer all questions

C 17.8°C D) 144°C 30. For an ideal gas, which pairs of variables are inversely proportional to each other (if all other factors remain constant)? I. P,T II. P, V A) I and II only B) Ill and IV only C) II only D) I and III only 31. Three identical flasks contain three different gases at standard temperature and pressure. Flask A contains Ar, flask B contains Ne, flask C contains H2. Which flask contains the largest number of molecules? A) flask A B) flask B C) flask C D) All flasks contain the same number of molecules. 32. A 75.0 L steel tank at 20.0°C contains acetylene gas, C2H2, at a pressure of 1.20 atm. Assuming ideal behavior, how many grams of acetylene are in the tank? A) 3.74 g B) 54.8 g C) 973g D) 1425 g 33. What is the density of carbon monoxide gas at STP? A) 0.510 g/L B) 0.800 g/L C) 1.96 g/L D) 1.25 g/L 34. Chloroform is a volatile liquid once commonly used in the laboratory but now being phased out due to its ozone depletion potential. If the pressure of gaseous chloroform in a flask is 195 mm Hg at 25 C and its density is 1.25 g/L, what is the molar mass of chloroform? A) 10.0 g/mol B) 76.3 g/mol C) 119 g/mol D) None of these 35. When 30.0 g of zinc metal reacts with excess HCI, how many liters of H2 gas are produced at STP? A) 0.229 L B) 0.458 L C)5.14 L D) 10.3 L 36. How many liters of oxygen are needed to exactly react with 55.6 g of methane at STP? CH4(g)+2O28) CO2(8) 2 H200) A) 19.5L B) 390 L

Explanation / Answer

30)

Gas law equation can be written as

PV= nRT,

when pressure and volume are constant

nRT= constant

nT= constant since R is any way constant

n =constan/T

n is inversly related to temperature in K.

when P and n are constant

V=(nR/P)*T

V = Constant *T

so V is directly proportional to temperature (T) in K.

Similar relation of P proportional to (T) can also be established when V and n are constant.

so C is correct.

32)

Given
Volume, V = 75.0 L
Pressure, P = 1.20 atm
Temperature, T = 20.0 0C = 293 K
Form ideal gas equation
    PV = nRT

Moles of acetylene, n = PV / RT
                                     = (1.20 atm)(75.0 L) / (0.0821 L-atm/K.mol)(293K)
                                     = 3.741mol

Mass of acetylene = moles * molar mass
                             = 3.741 mol * 26 g/mol
                             = 97.26
                             ˜ 97.3 g

Hence option C is correct.

33)

Molar mass of CO2 gas is = 44 gmol-1

STP CONDITIONS ARE.

PRESSURE = 1 bar

Temperature = 273 K

R = 0.083 bar dm3 mol-1 K-1

According to ideal gas equation.

PV = nRT , where n = no of moles of gas n = given mass / molar mass

P = dRT/ M

d = PM/ RT

= 1 * 44 / 0.083 * 273

= 1.94 gdm-3

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