Answer:
The specific heat of sodium is 1,23J/g°C
Explanation:
Using the atomic weight of sodium (23g/mol) and the atomic weight definition, we have that each mole of the substance has 23 grams of sodium.
starting from this, we use the atomic weight of sodium to convert the units from J / mol ° C to J / g ° C

The correct answer is D. Number of grams of salt per kilometer of water.
Hydrogen has only one electron. It has one proton of nucleus and one outter electron.