Which sample of Hcl(aq) reacts at the fastest rate with a 1.0 gram-sample of iron filings
1) 10Ml or 1M Hcl(aq) at 10c
2) 10Ml of 1M Hcl(aq) at 25c
3) 10Ml or 3M Hcl(aq) At 10c
4) 10Ml of 3M Hcl(aq) at 25c

10Ml of 3M Hcl(aq) at 25c

Explanation:

Among the factors that affect the rate of reaction are concentration and temperature. According to the collision theory, reaction rate is increased when there is an increase in the number of effective collisions (collisions involving particles of appropriate activation energy).

If the concentration is increased, more particles are available in the reaction system and the particles collide more frequently leading to an increase in the rate of reaction. Hence 10ml of 3M HCl having the highest concentration is expected to also show the faster rate of reaction.

Increase in temperature imparts greater kinetic energy to reacting particles. It is known that for every 10° rise in temperature, the rate of reaction doubles. Hence as temperature increases, the reaction proceeds even faster.

Thus, we can conclude that, 10ml of 3M HCl(aq) at25° will exhibit the fastest rate of reaction among the options listed.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2