2. List three sources of error that could account for the differences between your values for the enthalpy of fusion of water and the accepted value of 334 J/g.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock