a student heats a compound to constant mass and then leaves it sit out for a few hours. She comes back, remanded the sample and finds it has a greater mass than before. Explain how this could happen. ANY HELP IS MUCH APPRECIATED! :)

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

Acetylene gas c2h2 undergoes combustion to produce carbon dioxide and water vapor how many grams of water are produced by the same amount of c2h2?

Fertilizer is sold in 100 pound bags labelled with the amount of nitrogen ( n), phosphoric acid ( p2o5), and potash ( k2o) present. the mixture of these nutrients varies from one type of fertilizer to the next. for example, a 100100 pound bag of vigoro ultra turf fertilizer contains 2929 pounds of nitrogen, 33 pounds of phosphoric acid, and 44 pounds of potash. another type of fertilizer, parker's premium starter, has 1818 pounds of nitrogen, 2525 pounds of phosphoric acid, and 66 pounds of potash per 100100 pounds. determine the amount of each type required to yield a mixture containing the 112112 pounds of nitrogen, 8181 pounds of phosphoric acid, and 2626 pounds of potash.