Câu 8: Chọn phương án đúng: Cho phản ứng : N2 (k) + O2 (k) = 2NO (k) có
0 H298
= +180,8 kJ.

Ở điều kiện tiêu chuẩn ở 25oC , khi thu được 1 mol khí NO từ phản ứng trên thì:

6

A. Lượng nhiệt tỏa ra là 180,8 kJ. B. Lượng nhiệt thu vào là 180,8 kJ.
C. Lượng nhiệt tỏa ra là 90,4 kJ. D. Lượng nhiệt thu vào là 90,4

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.

Which liquid (h2o, h2o + soap, or h2o + salt) has the strongest cohesion and adhesion? (need now plz)

Suppose you mix one mole of sulfuric acid (h2so4) with 1 mole of sodium hydroxide(naoh). why does the ph of the solution remain below 7? ( explain so i can get better understanding! )