Question

A 125 mL glass bulb contains 0.138 g sample of propane, C3H8, at 22C. What is the pressure of this gas? [R = 0.0821 L atm mol-1 K-1]

a. 0.61 atm

b. 0.28 atm

c. 0.045 atm

d. 0.0061 atm

e. 0.000045 atm

Acetylene can be made by reacting calcium carbide with water:

CaC2(s) + 2 H2O(l)→Ca(OH)2(s) + C2H2(g)

What is the maximum volume of acetylene that can be obtained from 225 g of calcium carbide at 23C and 645 torr? [R = 0.0821 L atm mol-1 K-1; 760 torr = 1 atm]

a. 75.0 L

b. 100. L

c. 125 L

d. 150. L

e. 175 L

At 27C and 0.45 atm, an unknown pure gas has a density of 0.733 g/L. Which of the following gases could be the unknown gas?

1. NO
2. Ne
3. C2H2
4. C3H4
5. F2

Answer 1

Ideal gas equation:
PV = nRT
Here,
P is pressure
V is volume
n is number of moles
R is gas constant
T is temperature

I CA ve 125 m2 x 12 = 0.125 L TOOL n= 0.138 g Ca Hgx Imole Hq - 0.00373 mol 24.049 (Up R: 0.0821 Lahimolis T. 27361273 = 295 k p= nR Pa 0.00313 motx 0.0821 Escalone * 2954 oorny p= 0.606 ahm 80.61 ahm Hent, conut option is (cadoool alm) cale (s) + 2 H₂Orel Calolle talk Cs] amol cas, Imolal, Nungen d nokes ad CH: 220 g catx molcat . Imolali - 64.0989 sec notace = 3:51 molah, volume at Cal2: n=3.5 moli = 2 3+27 2 - 296k; P: 645 torx lan a o.fya ala 770 terv vz pe net ve 3.51 mble 0.08 u licha xze. most zquic - V 100L oosua atin Heno conet opl.sn (6) 100. mon mon- dR1] = 0.733 9/yx 0.0821 toals her book (Calta] 0.45 ale -40.1 g/mol