Hydrogen cyanide can be prepared by the reaction: CH4 (g) + NH3 (g) →HCN (g) + 3H2 (g)

What is the heat of reaction at constant pressure? Use the following thermochemical equations:

N2 (g) + 3H2 (g)→ 2NH3 (g); Δ\DeltaΔ H = -91.8 kJ
C (graphite) + 2H2 (g) →CH4 (g); Δ\Delta Δ H = -74.9 kJ
H2 (g) + 2C (graphite) + N2 (g)→2HCN (g); Δ \Delta Δ H = 270.3 kJ

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

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.

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?