1.W wyniku reakcji chemicznej 30 g glinu z tlenem powstało 84 g tlenku glinu. Oblicz, ile gramów tlenu wzięło udział w tej reakcji chemicznej.

2.W wyniku rozkładu 46 g wody otrzymano 6 g wody i wodoru. Oblicz, ile gramów tlenu powstało w wyniku tej reakcji chemicznej.

Could you rewrite the question you are asking in english?

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

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )