Observe: Drag the ball to the 1-m shelf on the SIMULATION pane. What is the ball’s potential energy (PE)? Move the ball to the 2-m shelf. What is its potential energy now? What do you think the ball’s potential energy will be on the 3-m shelf? The 4-m shelf? PE on 3-m shelf: PE on 4-m shelf:

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Explanation:

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"