Determine the temperature of 2.49 moles of gas contained in a 1.00 L vessel at a pressure of 143 kPa. ( R = 8.314) 895 K

539 K

0 K

7 K

What layer of the atmosphere is directly above the troposphere?

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 the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons