A sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of 22.1 g NH3. The theoretical yield is 26.9 g. What is the percent yield for this reaction? Reaction: N2(g) + 3 H2 (g) → 2 NH3 (g)

List four observations that indicate that a chemical reaction may be taking place

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.