- If I leave 750 mL of 0.75 M sodium chloride solution uncovered on a windowsill and 150 mL of the solvent evaporates, what
will the new concentration of the sodium chloride solution be?

- To what volume would I need to add water to the evaporated
solution in problem 3 to get a solution with a concentration of
0.50 M?

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.