The mass of a nucleus is 0.042 amu less than the sum of the masses of 3 protons and 4 neutrons. The binding energy per nucleon i
2 answers:
Answer: 5.6 Mev
Explanation: Binding energy is calculated by using the formula,
bonding energy = mass defect x 931 Mev
mass defect is given as 0.042 amu.
So, binding energy = 0.042 x 931 Mev = 39.012 Mev
Sum of protons and neutrons is known as number of nucleons. Li has 3 protons and 4 neutrons.
So, number of nucleons = 3+4 = 7
Binding energy per nucleon =
binding energy per nucleon = 5.6 Mev
So, the binding energy per nucleon for Li is 5.6 Mev where Mev stands mega electron volt.
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Answer:
1) Endothermic.
2)
3)
Explanation:
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1) In this case, for these calorimetry problems, we can realize that since the temperature decreases the reaction is endothermic because it is absorbing heat from the solution, that is why the temperature goes from 22.00 °C to 16.0°C.
2) Now, for the total heat released by the reaction, we first need to assume that all of it is released by the solution since it is possible to assume that the calorimeter is perfectly isolated. In such a way, it is also valid to assume that the specific heat of the solution is 4.184 J/(g°C) as it is mostly water, therefore, the heat released by the reaction is:
3) Finally, since the enthalpy of reaction is calculated by dividing the heat released by the reaction over the moles of the solute, in this case NH4Cl, we proceed as follows:
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