The rate of growth is faster in the (10 - 14) age group and slows down after the age of 14. After the age of 16 the growth is the slowest
A 1. 30 m solution of the weak acid ha is created. if the ka of the weak acid is 3. 06×10−9, the pH of the solution is 3.71.
Firstly we will get the equilibrium concentration, we will write the ICE chart for the reaction.
HA ------ (H+) + (A-)
1.30 0 0
1.30-x x x
Now,
the equilibrium expression can be given as
Ka = [H+] [A-]/[HA]
3. 06×10−9 = x^2/(1.30-x)
x = 1.99 × 10^(-4)
Therefore, the concentration of [H+] is 1.99 × 10^(-4).
<h3>Calculation of pH</h3>
pH = -log[H+]
pH = -log(1.99 × 10^(-4))
pH = 4-0.29
pH = 3.71
Thus, we find that the value pH of the solution is 3.71.
learn more about pH :
brainly.com/question/12481995
#SPJ4
Answer:
20.11 g.
Explanation:
What is given?
c (specific heat of iron) = 0.450 J/g °C.
Q (heat energy) = 179.85 J.
ΔT (change of temperature) = |31.42 °C - 51.29 °C| = 19.87 °C.
What do we need? Mass of iron (m)
Step-by-step solution:
Let's see the formula of specific heat:
Where c is specific heat, Q is heat energy, m is mass and ΔT is the change of temperature.
We just have to solve for 'm' to find the mass of iron and replace the given data that we have, like this:
The mass of the iron would be 20.11 g.
Hello!
Your answer is A.. Earth's core is the most dense layer and it consists of the outer core and the inner core.
Hope this helps :))
