Net force and need to show work :(

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.