In the formula for calcium nitrate below, how many atoms of nitrogen are represented? 2 HNO3 + Ca(OH)2 ---> Ca(NO3)2 + 2 H2O

Select one:
a. 1
b. 2
c. 3
d. 6

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

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.