Astudent heats a sample of hydrate once, and the mass of the sample and the evaporating dish is 16.428 g. after a second heating cycle, the mass of the sample and the dish is 13.266 g. the student stops the heat/cool/weigh cycle after the second time. if the original mass of the evaporating dish and the hydrate was 25.637 g, and the mass of the evaporating dish alone was 1.135 g, what is the mass of water removed from the sample by heating? provide your response to three digits after the decimal.

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

According to le chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that reduces the stress. normalizes the stress. increases the stress. changes the stress.