Read the chemical equation. Fe2O3 + CO Fe + CO2 If 2 moles of Fe2O3 react with 9 moles of Co, how many moles of each product are formed? O 1 mole Fe and 2 moles CO2 thing O 2 moles Fe and 3 moles CO2 O4 moles Fe and 6 moles CO2 6 moles Fe and 9 moles CO2

04 moles Fe and 6 moles C02

Explanation:

Keywords are Moles here, you're given moles so you're going to use mole ratios.

First, we need to balance the Equation.

Fe2O3 + 3CO ---> 2Fe + 3CO2

Then we can set our ratios.

x = 4 Fe

x = 6 moles CO2

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