What is the energy change when 1 mol ⁴He is made from fundamental particles?

Strategy Use the results of the calculation of Example 21.9 and Equation 21.5:

Remember to express the mass defect in kilograms and the speed of light in meters per second.

Example 21.9

Calculate the mass defect of ⁴He. The atomic mass of the atom is 4.002602 atomic mass units (u) .
Strategy Use the information in Table 21.3, to calculate the atomic masses of the nucleons; then calculate the mass defect by the difference from its atomic mass of 4.002602 u.

Equation 21.5