Find the enthalpy of the following reaction at 25 °C using average bond enthalpies. H2 (g) + I2 (g) → 2 HI (g)

Average bond enthalpies (kJ/mol): E(H–H)=436, E(I–I)=151, E(H–I)=298

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.

How many moles of potassium are needed to react completely with 12.8 moles of magnessium bromide?

Which best describes eras and periods?