- suppose you had two atomic gases that react to form a diatomic gas A + B -> AB

Question

- suppose you had two atomic gases that react to form a diatomic gas A + B -> AB. Supposevyou perform this reaction with 1 mole each of A and B in a thermally isolated chamber so no heat is exchanged with the environment. The temperature of the final system
A) will remain the same
b) will decrease
c) will increase
d) could either increase or decrease depending in information that has not been provided in this problem

- the ends of the two rods are separated by 5 mm at 25 oC. the left rod is brass, whereas the right rod is steel. both rods have the same length and the far end of each rod rests firmly against a rigid wooden supports. if the ends of the rods facing each other just touch at 125 oC, what is the length of each bar??

a) 0.92 m
b) 2.0 m
c) 1.34 m
d) 1.56 m
e) 1.84 m

try your best thanks

Explanation / Answer

1)

for isolated system , there is no heat tranfer between system and

environment .so temperature will remain the same.
option ' a ' is correct answer
2)
from linear expansion ,
L =LT

for brss:

(L)_b =LT =(19*10^-6 /oC)(L)(100 degC) ......(1)

for STEEL:

(L)_st =LT =(12*10^-6 /oC)(L)(100 degC) ......(2)

air gap =(L)_b+(L)_st

5*10^-3 m = (L)(100 degC)[(19*10^-6 /oC)+(12*10^-6 /oC)]

there fore L =1.6 m

so this value nearly equal to your option 'd'

i.e., L1 =L2 =L =1.6 m 1.56 m

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