Answer: It will take 8.2 minutes until the concentration decreases to 0.055 M
Explanation:
The time after which 99.9% reactions gets completed is 40 minutes
Explanation:
Expression for rate law for first order kinetics is given by:
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
b) Time taken for 0.085 M to decrease to 0.055 M
Thus it will take 8.2 minutes until the concentration decreases to 0.055 M
It is to find an unbiased group of people unrelated to the event and it is a way for even the least patriotic citizens to serve their country. It also means there IS A JURY, if there wasn't; then it would come done to the whims of the judge.
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2(x) + 5(-2) = 0
x = 5
the oxidization number of P in P₂O₅ is 5
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<span>Since we're going to need to calculate molar masses, let's start with looking up the atomic weights of the associated elements.
Atomic weight carbon = 12.0107
Atomic weight nitrogen = 14.0067
Atomic weight hydrogen = 1.00794
Atomic weight oxygen = 15.999
Molar mass H2O = 2 * 1.00794 + 15.999 = 18.01488 g/mol
Molar mass N2 = 2 * 14.0067 = 28.0134 g/mol
Now calculate the number of moles of H2O and N2 we have
Moles H2O = 6.63 g / 18.01488 g/mol = 0.368029096 moles
Moles N2 = 1.46 g / 28.0134 g/mol = 0.052117915 moles
Since there's 2 hydrogen atoms per H2O molecule, we have
2 * 0.368029096 mol = 0.736058192 moles
of hydrogen.
The mass of that hydrogen is
0.736058192 mol * 1.00794 g/mol = 0.741902494 g
Since there's 2 nitrogen atoms per N2 molecule, we have
2 * 0.052117915 mol = 0.10423583 moles
We already know the mass of nitrogen we have.
Now we need to determine the mass of carbon we have and the number of moles of carbon.
Subtract the know mass of hydrogen and nitrogen from the total mass of Aniline. So
9.71 g - 0.741902494 g - 1.46 g = 7.508097506 g
Moles carbon = 7.508097506 g / 12.0107 g/mol = 0.625117396 mol
We now have the ratio of carbon : hydrogen : nitrogen of
0.625117396 : 0.736058192 : 0.10423583
We need to get a ratio of small integers that closely approximates the above ratio. Start by dividing all the numbers by the smallest of the numbers. Giving:
5.997145089 : 7.061470053 : 1
All three of those values are acceptably close to integers with the ratio of
6:7:1
So the empirical formula of Aniline is C6H7N</span>