Answer:
16.5 days
Explanation:
Given that:
Half life = 26.5 days
Where, k is rate constant
So,
The rate constant, k = 0.02616 days⁻¹
Using integrated rate law for first order kinetics as:
![[A_t]=[A_0]e^{-kt}](https://tex.z-dn.net/?f=%5BA_t%5D%3D%5BA_0%5De%5E%7B-kt%7D)
Where,
![[A_t]](https://tex.z-dn.net/?f=%5BA_t%5D)
is the concentration at time t
![[A_0]](https://tex.z-dn.net/?f=%5BA_0%5D)
is the initial concentration
Given:
35.0 % is decomposed which means that 0.35 of is decomposed. So,
![\frac {[A_t]}{[A_0]}](https://tex.z-dn.net/?f=%5Cfrac%20%7B%5BA_t%5D%7D%7B%5BA_0%5D%7D)
= 1 - 0.35 = 0.65
t = 7.8 min
![\frac {[A_t]}{[A_0]}=e^{-k\times t}](https://tex.z-dn.net/?f=%5Cfrac%20%7B%5BA_t%5D%7D%7B%5BA_0%5D%7D%3De%5E%7B-k%5Ctimes%20t%7D)
<u>t = 16.5 days.</u>
Answer:
(A)0.25L
Explanation:
By combination of Boyle's law and Charles law to obtain the general gas equation, we have:
P1V1/T1=P2V2/T2
P1=Inital pressure=1.00 atm
V1=Inital volume=4.91L
T1=Initial temperature=20°C=20+273=293Kelvin
P2=Final pressure=5.2atm
T2=Final temperature=(-196+273K)=77K
V2= final volume=?
by making V2 the subject of the above general gas equation
we have V2=P1V1T2/P2T1
=1×4.91×77/5.2×293
=0.248L
Answer:
Selenium has 36 valence electrons.
A.Because the Carbon dioxide in the air mixes it to form carbonic acid
Answer:
Paraffin Wax
Explanation:
Paraffin wax is one of the most widely used waxes for candle making. A cheaper alternative, it is a derivable from petroleum, coal or oil. This wax is white and odorless and will keep a consistent appearance throughout your candle's life.
