If the world was experiencing shortage of water or drought which human activity is the most important to maintain and why

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

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.