That seems to be standard notation
Answer:
The concentration of the acid is 117.92 ± 0.03 mM.
Explanation:
In this problem, the concentration of NaOH and the volume used is given. The volume pipetted from the acid is also given. The concentration of the acid is given by:
CNaOH * VNaOH = Cacid * Vacid
158.32 * (18.76-0.14) = C acid * 25
C acid = 117.92 mM
The propagation of error for this problem, which is a multiplication is the concentration of the acid multiplied by the error divided by its respective value as shown in the equation below
error = 117.92 * 
The answer is 0.03 mM of uncertainty.
Answer:
During oxidation of organic compounds by molecular oxygen to produce carbon dioxide and water electrons will move from carbon to oxygen due to which energy will release.
Explanation:
Electrons move towards atoms which have higher affinity for them (like oxygen atoms) from atoms which have lower affinity like carbon atoms therefore the oxidation of organic compounds by molecular oxygen to produce CO2 and water release free energy since during oxidation of organic compounds by molecular oxygen to produce carbon dioxide and water electrons will move from carbon to oxygen due to which energy will release.