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.
Letâs say that, according to your calculations, you need enough paint to cover 500 square feet. How many gallons do you need to buy to get the job done? Manufacturers typically say that one gallon of paint covers 250 to 400 square feet. Thatâs a pretty wide range, largely due to the fact that different surfaces take paint differently. If you are painting a smooth surface, chances are you can stretch a gallon to cover 400 square feet.