The reaction below shows the reaction of magnesium reacting with excess oxygen gas to produce magnesium oxide. Assume that 5.63 g of Mg reacts with excess oxygen to produce 8.38 g of Mgo.
2Mg + 0, → 2MgO
What is the approximate percent yield for this reaction?

Apure solvent has a vapor pressure the vapor pressure of a solution. a. equal to b. lower than c. higher than

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.

What best discribes the relationship between wavelength and frequency in a electromagnetic wave