The question is incomplete, the complete question is:
Consider the reaction:

At equilibrium, the concentrations are as follows. [NOCl] = 1.4 × 10–2 M [NO] = 1.2 × 10–3 M [Cl2] = 2.2 × 10–3 M What is the value of Keq for the reaction expressed in scientific notation?
A) 1.6 × 10–5
B) 6.2 × 10–4
C) 6.2 × 10+4
D) 1.6 × 10+5
<u>Answer:</u> The correct option is A) 
<u>Explanation:</u>
The equilibrium constant is defined as the ratio of the concentration of products to the concentration of reactants raised to the power of the stoichiometric coefficient of each. It is represented by the term 
For the given chemical equation:

The expression for equilibrium constant will be:
![K_{eq}=\frac{[NO]^2}{[Cl_2][NOCl]^2}](https://tex.z-dn.net/?f=K_%7Beq%7D%3D%5Cfrac%7B%5BNO%5D%5E2%7D%7B%5BCl_2%5D%5BNOCl%5D%5E2%7D)
Given values:
![[NO]=1.2\times 10^{-3}M](https://tex.z-dn.net/?f=%5BNO%5D%3D1.2%5Ctimes%2010%5E%7B-3%7DM)
![[Cl_2]=2.2\times 10^{-3}M](https://tex.z-dn.net/?f=%5BCl_2%5D%3D2.2%5Ctimes%2010%5E%7B-3%7DM)
![[NOCl]=1.4\times 10^{-2}M](https://tex.z-dn.net/?f=%5BNOCl%5D%3D1.4%5Ctimes%2010%5E%7B-2%7DM)
Putting values in above expression, we get:

Hence, the correct option is A) 
Answer:
Joule
Explanation:
When we think about the law of conservation of mass, we tend to think about the actual mass of objects. However we forget that energy can be turned into mass, and in turn, mass can be turned into energy. Sometimes there is a loss in mass, but energy is released into the environment which we can always see or measure. So therefore the most inclusive unit of measure to use when referring to the <em>law of conservation of mass</em> is in fact the unit for energy, the joule.
Well the average American makes about 29 pounds a week so, 52x29= 1508. the average American generates about 1508 pounds a year.
Allelopathy, the pine needles make the ground more acidic so weeds cannot grow and steal nutrients the tree needs