A light strikes the boundary of a medium at a 45° angle. Instead of entering the second medium, the light reflects back into the first medium. What can
you conclude about the index of refraction of the second medium?
A. It is much larger than the index of refraction of the first medium.
B. It must be equal to zero.
C. It is much smaller than the index of refraction of the first medium.
D. It must be equal to 1.00.

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може ли да зареждате повече информация, моля

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

it's c (engineer's do their work with mechanical stuff not on any living being)