When 3.66 g of KOH (∆Hsol = -57.6 kJ/mol) is dissolved in 150.0 mL of solution, it causes a temperature change of 5.87 °C.
The enthalpy of solution of KOH is -57.6 kJ/mol. We can calculate the heat released by the solution (Qr) of 3.66 g of KOH considering that the molar mass of KOH is 56.11 g/mol.
According to the law of conservation of energy, the sum of the heat released by the solution of KOH (Qr) and the heat absorbed by the solution (Qa) is zero.
150.0 mL of solution with a density of 1.02 g/mL were prepared. The mass (m) of the solution is:
Given the specific heat capacity of the solution (c) is 4.184 J/g･°C, we can calculate the change in the temperature (ΔT) of the solution using the following expression.
When 3.66 g of KOH (∆Hsol = -57.6 kJ/mol) is dissolved in 150.0 mL of solution, it causes a temperature change of 5.87 °C.
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Answer:
Noble Gases
Explanation:It's not on there but Noble gases is the least reactive element because it has 8 electrons and their outer energy is full.
Answer:
4. H-3 and He-4
Explanation:
H-3 means hydrogen with a mass number of 3. Mass number is the addition of protons and neutrons in the nucleus. Hydrogen always has 1 proton because it has atomic number 1, therefore the number of neutrons is found by subtracting 1 from the mass number (3).
3-1= 2 neutrons
He-4 also has 2 neutrons. He-4 has mass number 4, which means that its protons and neutrons added together equals 4. Helium has 2 protons because it has atomic number 2.
Therefore 2 + neutrons =4
neutrons =4-2
neutrons =2
An electron has a high probability of being in certain regions. Hence, option C is correct.
<h3>What is the meaning of electron cloud?</h3>
The system of electrons surrounding the nucleus of an atom.
The electron cloud model tells us that electrons are found in defined energy states outside of the nucleus of the atom. The lowest possible state for an electron is called its ground state.
The energy levels can only hold a certain number of electrons at any time and the organization of these electrons in the electron cloud is called the atom's electron configuration.
Energy levels describe distances from the nucleus in which electrons can be found. There is a maximum number of electrons that can be found at any particular energy level due to the limitations of its size.
Hence, an electron has a high probability of being in certain regions.
Learn more about the electron clouds here:
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