13) Initial volume(V1) =4.39 L
initial temperature (T1) = 44 C = 273 + 44 = 317 K
final volume (V2) = 3.99 L
pressure is maintained constant at 729 torr
by Charles law
V1/T1 = V2/T2
4.39/317 = 3.99/T2
T2 = (3.99 x 317)/4.39
T2 = 288.11 K
temperature in celcius = 288.11 - 273 =15.1 C
E is correct option
14.)
given ,
number of moles(n) = 2.35
Temperature(T) = 469 K
Pressure(P) = 1 atm
from ideal gas law equation
PV = nRT (here R = gas constant = 0.0821 L atm/ mol K)
V = nRT/P
V =( 2.35 x 0.0821 x 469) /1.00
V = 90.48 L 90.5 L
Option A is the answer
15) Given
mass of water (m) = 4,25 g
specific heat of water(c) = 4.18 J/g-K
initial temperature (Ti) = 25 C = 25 +273 =298 K
final temperature = Tf
Heat added (Q) = 133 J
Relation between specific heat and temperature is given as
Q = mc T
Q = mc (Tf -Ti)
133 = 4.25 x 4.18 (Tf - Ti)
Tf - 298 = 7.07
Tf = 298 + 7.07
Tf = 305.07
Tf = 305.07 - 273 32.1 C
Option B is correct
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