Mármore é uma rocha metamórfica originada de calcário exposto a altas temperaturas e pressão de baixa a moderada. Um dos principais componentes é o carbonato de cálcio - . Analisando a reação de decomposição do mármore representada a seguir: CaCO₃(s) → CaO(s) + CO₂(g) Com base nas entalpias de formação, dadas a seguir, calcular a variação da entalpia (ΔH) da reação: CaO(s) = -635,5 Kj/mol CO₂(g) = -394 Kj/mol CaCO₃(s) = - 1207 Kj/mol * 1 ponto
a) + 2236,5 Kj
b) - 177, 5 Kj
c) - 37 Kj
d) + 177, 5 Kj
e) - 2236,5 Kj

I'm sorry I can't understand that

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation:

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