Question

What is the mass defect of lithium? Assume the following: Atomic number of lithuim= 3 Atomic mass of lithuim= 7.0144 atomic mass units. Mass of 1 proton = 1.0073 atomic mas units. Mass of 1 neutron = 1.0087 atomic mass units.

Answer 1

Answer:0.0423 atomic mass units

Step-by-step explanation:

Answer 2

0.0423 amu.

Step-by-step explanation:

• Li atom has 3.0 protons and 4.0 neutrons.

• The mass of Li = mass of protons + mass of neutrons.

• The mass of protons = (3)(1.0073 amu) = 3.0219 amu.

• The mass of neutrons = (4)(1.0087 amu) = 4.0348 amu.

• The mass of Li = mass of protons + mass of neutrons = 3.0219 + 4.0348 = 7.0567 amu.

• The mass defect of Li = the mass of Li - the atomic mass of Li = 7.0567 - 7.0144 = 0.0423 amu.