In what frame of reference would you be at rest while riding in a car? a. the people on the street b. a child pulling a wagon c. a bridge over the highway d. the others in the car

D. with the others in the car

In the frame of reference when you look at others riding with you in the car, they look motionless but yet are moving. If we look at a moving car from outside of the car, it appears in motion. Now if you happen to be running at the same speed as the car and you look over it would appear motionless again.

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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