Atomic number of Fluorine-19 is 9. So, it must have 9 protons. As the mass number is 19, the number of neutrons will be 10.
In Tungsten-184, the number of protons is 74 and the number of electrons should also be 74.
In cobalt-59, the mass number should be 27 protons +22 neutrons = 49.
Answer : The enthalpy change of reaction is -23.9 kJ
Explanation :
According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.
According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
The given final reaction is,
The intermediate balanced chemical reaction will be,
(1)
(2)
First we will reverse the reaction 1 and multiply equation 2 by 3 then adding both the equation, we get :
(1)
(2)
The expression for final enthalpy is,
Therefore, the enthalpy change of reaction is -23.9 kJ
Answer:
the root stem
Explanation:
it is above the ground and includes the irgans such as leaves,buds, flowers and fruit (if the plant has any)
Answer:
Increases.
Explanation:
Temperature is the measure of the average kinetic energy of a system. As temperature increases, so will kinetic energy. As kinetic energy increases, speed increases.
Answer:
2NaBr + Ca(OH)2 ––> CaBr2 + 2NaOH