Dissolving 3.00 g of an impure sample of calcium carbonate in
hydrochloric acid produced 0.656 L of carbon dioxide at
20.0°C and 792 mmHg.
CaCO3(s) + 2HCl(aq) = CaCl2(aq) + CO2(g) + H2O(1)
Calculate the percent by mass of calcium carbonate in the
original sample

c. orbital shape i hope this is correct

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.