Answer :
The correct expression for rate of reaction is:
![Rate=-\frac{d[A]}{dt}=-\frac{1}{2}\frac{d[B]}{dt}=+\frac{d[C]}{dt}](https://tex.z-dn.net/?f=Rate%3D-%5Cfrac%7Bd%5BA%5D%7D%7Bdt%7D%3D-%5Cfrac%7B1%7D%7B2%7D%5Cfrac%7Bd%5BB%5D%7D%7Bdt%7D%3D%2B%5Cfrac%7Bd%5BC%5D%7D%7Bdt%7D)
The [A] decreasing at 0.14 mol/L.s
Explanation :
The given rate of reaction is,

The expression for rate of reaction :
![\text{Rate of disappearance of A}=-\frac{d[A]}{dt}](https://tex.z-dn.net/?f=%5Ctext%7BRate%20of%20disappearance%20of%20A%7D%3D-%5Cfrac%7Bd%5BA%5D%7D%7Bdt%7D)
![\text{Rate of disappearance of B}=-\frac{1}{2}\frac{d[B]}{dt}](https://tex.z-dn.net/?f=%5Ctext%7BRate%20of%20disappearance%20of%20B%7D%3D-%5Cfrac%7B1%7D%7B2%7D%5Cfrac%7Bd%5BB%5D%7D%7Bdt%7D)
![\text{Rate of formation of C}=+\frac{d[C]}{dt}](https://tex.z-dn.net/?f=%5Ctext%7BRate%20of%20formation%20of%20C%7D%3D%2B%5Cfrac%7Bd%5BC%5D%7D%7Bdt%7D)
So,
![Rate=-\frac{d[A]}{dt}=-\frac{1}{2}\frac{d[B]}{dt}=+\frac{d[C]}{dt}](https://tex.z-dn.net/?f=Rate%3D-%5Cfrac%7Bd%5BA%5D%7D%7Bdt%7D%3D-%5Cfrac%7B1%7D%7B2%7D%5Cfrac%7Bd%5BB%5D%7D%7Bdt%7D%3D%2B%5Cfrac%7Bd%5BC%5D%7D%7Bdt%7D)
Now we have to calculate how fast is [A] decreasing.
Given:
![-\frac{d[B]}{dt}=0.28mol/L.s](https://tex.z-dn.net/?f=-%5Cfrac%7Bd%5BB%5D%7D%7Bdt%7D%3D0.28mol%2FL.s)
![-\frac{1}{2}\frac{d[B]}{dt}=-\frac{1}{2}\times 0.28mol/L.s=-0.14mol/L.s](https://tex.z-dn.net/?f=-%5Cfrac%7B1%7D%7B2%7D%5Cfrac%7Bd%5BB%5D%7D%7Bdt%7D%3D-%5Cfrac%7B1%7D%7B2%7D%5Ctimes%200.28mol%2FL.s%3D-0.14mol%2FL.s)
![-\frac{d[A]}{dt}=-\frac{1}{2}\frac{d[B]}{dt}=-0.14mol/L.s](https://tex.z-dn.net/?f=-%5Cfrac%7Bd%5BA%5D%7D%7Bdt%7D%3D-%5Cfrac%7B1%7D%7B2%7D%5Cfrac%7Bd%5BB%5D%7D%7Bdt%7D%3D-0.14mol%2FL.s)
Hence, the [A] decreasing at 0.14 mol/L.s
Sound waves are things you can hear but you cant see. light waves on the other hand you can see when something gets to hot these are called heat waves. on the other hand they both are the same because they both are waves of something.
Red shift of star is defined as its wavelength. Star with smaller red shift have smaller wavelength, while star with greater red shift have greater wavelength. We can say that, Star X have smaller wavelength, while star Y have greater wavelength.
Answer:
15.83 KW
Explanation:
Losing heat at a rate = 60000btu/h
Gaining heat at a rate = 6,000btu/h
The difference in heat levels
= 60000btu/h - 6000btu/h
= 54000btu/h
So we need to convert 54000btu/h to KW
1kw = 3412.142btu
? = 54000btu
We cross multiply
54000btu x 1kw = ?3412.142btu
So we divide through by 3412.142 to get the unknown
54000/3412.142
= 15.83kw
So we can conclude that 15.83kw is the required power of this heater to keep the house at a constant temperature