Prove that the AHi' for BrF is the same when calculated with Hess's Law and sum of the AH' for BrF 1. The AH for the following reaction equals -89 kJ:
BrF, + Br2 - BrFs + 2 BrF
In addition, these two standard enthalpies of formation are known: BrF, = -941 kJ and BrFs = -840 kJ
Determine the AH; for Brf.
2. Here are all three data reactions written out in equation form:
and here is the target equation: 2Br2 +/F2 - Brf AH = ?
Br2+2F2 - Brf, AH = -941 kJ
Br2 +F2 - BrFs AH, = -840 kJ
BrF,+Bra - Brfs + 2 BrF AH = -89 kJ

water   molecules stay close to each other through cohesion, the collective action of hydrogen bonds between water molecules. cohesion plants draw water upwards from the root through the stem's transport tubes (xylem) to the leaf. this transport occurs even in large trees and against gravity. transpiration, evaporation of water from plant leaves, creates a tension on water molecules being pulled up from the stem and roots.

water also has high (the attraction of one substance to another) properties because of its polar nature. adhesion of water molecules to plant cell walls counteract gravity while water is transported from roots to leaves.

water exhibits a very high surface tension when compared to other liquids. surface tension is a property of a liquid that holds the surface together and allows it to resist an external force. by capillary action, the water forms concave menisci inside the pores. the high surface tension of water pulls the concavity outwards, generating enough force to lift water from the roots to the leaves of plants.

thus, cohesion, along with adhesion and surface tension creates a capillary action that keeps water molecules interacting and moving through the plants out to the leaf cells.

therefore, option d) is the correct answer.

explanation:

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.