Answer:
5.64
Explanation:
We are given;
- The concentration of H+ ions as 2.3 x 10^-6 M
We are required to get the pH
- pH is given by getting the negative logarithm of hydrogen ion concentration.
- That is; pH = -log [H+]
Therefore;
pH = - log [2.3 x 10^-6 M]
= 5.638
= 5.64
Hence the pH of the solution is 5.64
By the recreation of the congregated atomic molecules that relatively acquire the evolutionary theory.
Answer:
1.
work out the mean mode median and range
Explanation:
Answer:
There is 23 protons and 23 electrons in a vandium atom!
Hope this helps :)
Explanation:
Answer:
ΔH°f(C₈H₁₈(g)) = -210.9 kJ/mol
Explanation:
Let's consider the combustion of C₈H₁₈.
C₈H₁₈(g) + 25/2 O₂(g) ⟶ 8 CO₂(g) + 9 H₂O(g) ΔH°rxn = − 5113.3 kJ
We can calculate the standard enthalpy of formation of C₈H₁₈(g) using the following expression.
ΔH°rxn = 8 mol × ΔH°f(CO₂(g)) + 9 mol × ΔH°f(H₂O(g)) - 1 mol × ΔH°f(C₈H₁₈(g)) - 25/2 mol × ΔH°f(O₂(g))
1 mol × ΔH°f(C₈H₁₈(g)) = 8 mol × ΔH°f(CO₂(g)) + 9 mol × ΔH°f(H₂O(g)) - 25/2 mol × ΔH°f(O₂(g)) - ΔH°rxn
1 mol × ΔH°f(C₈H₁₈(g)) = 8 mol × (-393.5 kJ/mol) + 9 mol × (-241.8 kJ/mol) - 25/2 mol × 0 kJ/mol - (− 5113.3 kJ)
ΔH°f(C₈H₁₈(g)) = -210.9 kJ/mol