88 points answer fast

at 9: 00 am a car was driving down the highway at a constant velocity of 60 mph. at 9: 30 am the car entered a speed zone and started going 40 mph. at 10: 00 am the driver got stuck in traffic and had to slow down to only 25 mph. at 10: 30 am the driver reached his destination. which statement about the car's trip is correct?

a. the car had a positive acceleration the entire time.

b. the car experienced negative acceleration from 9: 30- 10: 00.

c. the acceleration of the car from 10: 00-10: 30 was zero.

d. the car did not accelerate during the trip.

A

Explanation:

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