Final answer:
The momentum of an electron with a mass of 9.1 x 10^-31 kg moving at 2.18 x 10^6 m/s is 1.9828 x 10^-24 kg·m/s.
Step-by-step explanation:
To determine the momentum of an electron, we use the formula p = mv, where p is the momentum, m is the mass of the electron, and v is the velocity. Given the mass m = 9.1 x 10-31 kg and the velocity v = 2.18 x 106 m/s, the momentum of the electron moving in a Bohr orbit in the hydrogen atom can be calculated as follows:
p = (9.1 x 10-31 kg) x (2.18 x 106 m/s)
p = 1.9828 x 10-24 kg·m/s
Therefore, the momentum of the electron is 1.9828 x 10-24 kg·m/s.