<span>The Iridium satellite
constellation is a satellite providing voice and data coverage to satellite
phones, pagers and integrated transceivers over the Earth’s entire surface. It was
discovered by Bary Bertiger, Rey Leopold and Ken Peterson in 1987 and then
developed by Motorola from 1993 to 1998.</span>
Answer:
is the correct answer to the given question.
Explanation:
Given k=6.40 x 10-3 min-1.
According to the first order reaction .
The concentration of time can be written as
![[\ A\ ]\ = \ [\ A_{0}\ ] * e \ ^\ {-kt}](https://tex.z-dn.net/?f=%5B%5C%20A%5C%20%5D%5C%20%3D%20%5C%20%5B%5C%20%20A_%7B0%7D%5C%20%5D%20%20%2A%20e%20%5C%20%5E%5C%20%20%7B-kt%7D)
Here
= Initial concentration.
So ![[\ A\ ]_{0}= 0.0314 M](https://tex.z-dn.net/?f=%5B%5C%20A%5C%20%5D_%7B0%7D%3D%200.0314%20M)
Putting this value into the above equation.

=0.211 M
This can be written as

Answer:
2.8 mol/min is the rate of appearance of
at that moment.
Explanation:

Rate of the reaction = R
![R=\frac{-1}{2}\frac{d[N_2O_5]}{dt}=\frac{1}{4}\frac{d[NO_2]}{dt}=\frac{1}{1}\frac{d[O_2]}{dt}](https://tex.z-dn.net/?f=R%3D%5Cfrac%7B-1%7D%7B2%7D%5Cfrac%7Bd%5BN_2O_5%5D%7D%7Bdt%7D%3D%5Cfrac%7B1%7D%7B4%7D%5Cfrac%7Bd%5BNO_2%5D%7D%7Bdt%7D%3D%5Cfrac%7B1%7D%7B1%7D%5Cfrac%7Bd%5BO_2%5D%7D%7Bdt%7D)
Rate of disappearance of
is ![=-\frac{d[N_2O_5]}{dt}= 1.40 mol/min](https://tex.z-dn.net/?f=%3D-%5Cfrac%7Bd%5BN_2O_5%5D%7D%7Bdt%7D%3D%201.40%20mol%2Fmin)
![R=\frac{-1}{2}\frac{d[NO_2]}{dt}](https://tex.z-dn.net/?f=R%3D%5Cfrac%7B-1%7D%7B2%7D%5Cfrac%7Bd%5BNO_2%5D%7D%7Bdt%7D)

Rate of appearance of
is ![=\frac{1}{4}\frac{d[NO_2]}{dt}:](https://tex.z-dn.net/?f=%3D%5Cfrac%7B1%7D%7B4%7D%5Cfrac%7Bd%5BNO_2%5D%7D%7Bdt%7D%3A)
![R=\frac{1}{4}\frac{d[NO_2]}{dt}](https://tex.z-dn.net/?f=R%3D%5Cfrac%7B1%7D%7B4%7D%5Cfrac%7Bd%5BNO_2%5D%7D%7Bdt%7D)
![\frac{d[NO_2]}{dt}=4\times 0.70 mol/min=2.8 mol/min](https://tex.z-dn.net/?f=%5Cfrac%7Bd%5BNO_2%5D%7D%7Bdt%7D%3D4%5Ctimes%200.70%20mol%2Fmin%3D2.8%20mol%2Fmin)
2.8 mol/min is the rate of appearance of
at that moment.
Answer:
The symbol of the Element is simply just the abbreviation.
Mercury: Hg
Potassium: K
Nitrogen: N
Copper: Cu
Sulphur: S
Carbon: C
Chlorine: Cl
Oxygen: O
The number of unpaired valence electrons determine the radical in any element.
Mercury: Hg 2+
Potassium: K+
Nitrogen: N 2+
Copper: Cu 2+
Sulphur: S 2-
Carbon: C 4+
Chlorine: Cl -
Oxygen: O 2-
Glad I could help. Thanks for the question! Have a great day, and feel free to mark this brainliest!