Will give brainliest1. which element(s) are not balanced in this equation? fe2o3 + 3 co → fe + 3 co2 2. nitrogen gas (n2) and hydrogen gas (h2) combine to form ammonia (nh3). which equation correctly represents this reaction? a. n2+ 3h2 → 2nh3 b. 2nh → n + 3h2

1. would be the element "Fe"

2. Would be A since of course the end is balanced and makes it N2H6 and a regular ammonia atom would have one nitrogen and 3 hydrogen making it NH3 and if you make N2H6 into its empirical form you will get NH3.

1) The unbalanced elements in this equation is Fe and O. On the left side of the equation there are 2 Fe's and on the right there is only 1 and on the left there are 3 O's but on the right there are 6 because O2 three times is 2x3 and that equals 6.

2) A would be the correct answer because in order to keep the equation balenced there has to be 2 ammonia (NH3) molecules and 3 hydrogen (H2) bonded molecules.

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