Saltpeter is a compound made of potassium(k), nitrogen(n), and oxygen(o). every 100.0g of saltpeter contains 38.67g potassium and 13.86g nitrogen. what is the mass of oxygen contained in 285.0mg of saltpeter? answer needs to be in grams

For the following reaction, 5.65 grams of oxygen gas are mixed with excess hydrochloric acid . assume that the percent yield of water is 86.4 %. hydrochloric acid(aq) + oxygen(g) water(l) + chlorine(g) what is the ideal yield of water ? grams what is the actual yield of water ? grams

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

The best solution for preventing harm to people and pets from severe hurricanes involves determining and warning residents about what