How many grams of hydrogen gas will be produced if 2.12 g of potassium reacts with sufficient hydrochloric acid?

How many grams of hydrogen gas can be produced from the following reaction when  65 grams of zinc and 65 grams of HCl are allowed to react.

Zn(s)+2HCl(aq)→ZnCl  2 (aq)+H  2  (g)

The answer to that would be... 1.8

Explanation:

I think this might be an answer for a different question now that im think abt it......

Sorry.

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

i have no clue hope you find the answer