The thing that it is called is it is called the atomic number of the thing
<u>Answer:</u> The concentration of solution is 0.342 M
<u>Explanation:</u>
To calculate the molarity of solution, we use the equation:

We are given:
Mass of solute (Sodium chloride) = 15 g
Molar mass of sodium chloride = 58.5 g/mol
Volume of solution = 750 mL
Putting values in above equation, we get:

Hence, the concentration of solution is 0.342 M
I see you have access to the internet. Google 'Kelvin to C', and input 251. You'll get -22.15.
Answer:
Between 5.5 to 7.5
The optimum pH range for most plants is between 5.5 and 7.5