To determine the correct subscripts in a chemical formula, take H2O  as an example. H has a charged of positive 1 while O has a charge  of negative 2. To balance out the chaâ¦rges of the two elements, 2 H  cations are needed to balance out O negative 2 cation. This will  result to H2O.
How much area will one gallon of paint cover? Paint coverage is affected by numerous factors: the quality of the paint youâre using, the color youâre covering and the color youâre using. That said, a good rule of thumb is that one gallon of paint will cover between 350 and 400 sq. ft. Planning ahead will help you determine the amount of paint needed for a project.
Measure its length and height, and multiply those figures to get the square footage. Since a gallon of paint covers 350 square feet, divide the total square footage by 350. Round up to the nearest gallon. For example, if the walls of the room are 60 feet long and 10 feet high, the area is 600 square feet. Divide 600 by 350, and the answer is about 1.7 gallons, so about 2 gallons are necessary.