4.8g of sulfur and 5.4 g of aluminum react based on the chemical equation below and 4.5 g ofaluminum sulfide (AI2S3) are recoveredfrom the reaction, a small amount cannotbe recovered. 3S +2AI-> AI2S3
Determine the percent yield of AI2S3. (molar mass of S= 32.06 g/mol, molar mass of AI= 26.98 g/mol)

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

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.