Alum is a compound used in a variety of applications including cosmetics, water purification, and as a food additive. it can be synthesized from aluminum metal, sulfuric acid, water, and potassium hydroxide, as seen in the following equation:

2al(g) + 2koh(aq) + 4h2so4(aq) + 10h2o > 2kal(so4) + 12(h2o) = 3h2

using the data below, determine the theoretical and percent yield for this alum synthesis. note that aluminum is the limiting reactant.

bottle mass - 9.8981g

bottle with aluminum pieces - 10.8955g

final product with bottle mass - 19.0414g

sry but any answer choices

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j