Explain how NOTHING is ZERO, but ZERO is more than NOTHING?
1 answer:
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Given :
Initial mass , a = 150 gm .
Half time ,
.
Final mass , x = 18.75 gm .
To Find :
The time taken to decay 18.75 gm .
Solution :
We know , time taken is given by :
Here , k is a constant given by :
Putting all given value in above equation :
We get :
Therefore , time taken is 6.94 hours .
Hence , this is the required solution .
Answer:
a. True
b. False
c. True
d. False
e. False
Explanation:
A. (true) The equilibrium constant K is defined as
In any case
aA +Bb ⇌ Cd +dD
where K is:
A large value on K means that the concentration of products is bigger than the concentrations of reagents, so the forward reaction is favored, and the equilibrium lies to the right.
B. (False) When we work with gases, we use partial pressure to make calculations in the equilibrium, so we estimate Kp as:
Using the ideal gas law, we can get a relationship between K and Kp
Pv=nRT where we know that
is the molar concentration. When we replace P in the expression for Kp we get:
Reorganizing the equation:
We can see K in the expression
Delta n = c+d-a-b
For the reaction
Delta n = 2-1-1=0
So Kp=K in this case.
C. (true) The value of K just depends on the temperature that’s why changing the among of products won’t have any effect on its value.
D. (false) as we can see this reaction involve a heterogeneous system with solids and gases. For convention the concentration for solids and liquids can be considered constant during the reaction that’s why they’re not include in the calculation for the equilibrium constant. Taking this into account the expression for the equilibrium for this reaction is:
So we can see that is not include in the expression.
E. (False) The equilibrium is defined as the point where the rate of the forward reaction is the same to the rate of the reverse reaction. The value of K is telling you which reaction is favored but the rate of both reactions is the same in this point. (see picture)
