George is at a water park with his family. he needs to get a tube to use for one of the rides, and he chose his color first. there are black tubes, dark purple tubes, dark blue tubes, and yellow tubes. each member of his family had to choose a different colored tube. george chose a yellow tube, because he thought it would be the coolest. after everyone chose a tube, he touched all of the tubes. the yellow tube was the coolest. how do you think george knew that the yellow tube would be the coolest?
a) he knew that dark colors absorb energy, so they would be coolest.
b) he knew that dark colors reflect energy, so they would be coolest.
c) he knew that light colors absorb energy, so they would be coolest.
d) he knew that light colors reflect energy, so they would be coolest.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

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