A student measures the time it takes for two reactions to be completed. Reaction A is completedd in 12 seconds, and reaction B is completed in 2q seconds. What can you conclude about the rates of the reactions? A. The rate of reaction A is lower
B. The rates of reation A and B are equal
C. The rate of reaction B is lower

A. The rate of reaction A is lower

The reaction rate (v) shows the change in the concentration (reduction of reactants and product additions ) per unit time

Can be formulated:

Reaction: aA ⇒ bB

or

A = reactants

B = product

v = reaction rate

t = reaction time

Time of reaction A : 12 s

Time of reaction B : 2 s

Because reaction speed/the rate of reaction is inversely proportional to the time, then A. The rate of reaction A is lower

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