Answer : The time passed in days is 28.6 days.
Explanation :
Half-life = 14.3 days
First we have to calculate the rate constant, we use the formula :
![k=\frac{0.693}{t_{1/2}}](https://tex.z-dn.net/?f=k%3D%5Cfrac%7B0.693%7D%7Bt_%7B1%2F2%7D%7D)
![k=\frac{0.693}{14.3\text{ days}}](https://tex.z-dn.net/?f=k%3D%5Cfrac%7B0.693%7D%7B14.3%5Ctext%7B%20days%7D%7D)
![k=4.85\times 10^{-2}\text{ days}^{-1}](https://tex.z-dn.net/?f=k%3D4.85%5Ctimes%2010%5E%7B-2%7D%5Ctext%7B%20days%7D%5E%7B-1%7D)
Now we have to calculate the time passed.
Expression for rate law for first order kinetics is given by:
![t=\frac{2.303}{k}\log\frac{a}{a-x}](https://tex.z-dn.net/?f=t%3D%5Cfrac%7B2.303%7D%7Bk%7D%5Clog%5Cfrac%7Ba%7D%7Ba-x%7D)
where,
k = rate constant = ![4.85\times 10^{-2}\text{ days}^{-1}](https://tex.z-dn.net/?f=4.85%5Ctimes%2010%5E%7B-2%7D%5Ctext%7B%20days%7D%5E%7B-1%7D)
t = time passed by the sample = ?
a = let initial amount of the reactant = 100 g
a - x = amount left after decay process = 100 - 75.0 = 25.0 g
Now put all the given values in above equation, we get
![t=\frac{2.303}{4.85\times 10^{-2}}\log\frac{100}{25.0}](https://tex.z-dn.net/?f=t%3D%5Cfrac%7B2.303%7D%7B4.85%5Ctimes%2010%5E%7B-2%7D%7D%5Clog%5Cfrac%7B100%7D%7B25.0%7D)
![t=28.6\text{ days}](https://tex.z-dn.net/?f=t%3D28.6%5Ctext%7B%20days%7D)
Therefore, the time passed in days is 28.6 days.
The simplest ratio of elements in a molecule is called as Empirical Formula.
For Example,
Empirical formula of Benzene is CH
Empirical formula of Formaldehyde is CH₂O
Calculation of Empirical Formula:
Empirical formula can be calculated from Molecular formula by dividing the molecular formula with such number that all number of elements in molecular formula gets the lowest and simplest number.
Like Benzene Molecular formula is C₆H₆, when it is divided by 6 we get C₁H₁ or simply CH.
So, for acetic acid having molecular formula C₂H₄O₂ we can only divide it with 2 to have the simplest form, i.e.
C₂H₄O₂ ÷ 2 = C₁H₂O₁ or CH₂O
Result:
So the ratio of elements in acetic acid is
C : H : O
1 : 2 : 1
Answer:
it's easier to look it up
Explanation:
Answer:
the answer is in the picture
Answer:
38.5 L
Explanation:
For this question, we can use
V1/T1=V2/T2
where
V1 (initial volume)= 35 L
T1 (initial temperature in Kelvin)= 303 K
V2(final volume)= ?
T2 (final temperature in Kelvin)= 333K
Since we are trying to find the final volume, we can rearrange the equation to say
V2= (V1/T1) × T2
V2= (35/303)×333
V2= 38.5 L