Help, due tonight! If 30g of iron and 56g of oxygen react, how many grams of Iron II Oxide will form?

What is the total mass of iron in 1.0 mole of Fe2O3 ? 2(56) = 112. A) 160 g. (B) 112 g. C) 72 g. D) 56 g. 4. What is ... coating forms metal oxides that glow brightly when heated to a high temperature. During a test, a ... a Given the reaction 4Na fO2 → 2Nazo, how many moles of oxygen are completely ... 34g 16g 30g 28g. 6.

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

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.