A book that weighs 5 newtons is sitting on a table 1.5 meters above the floor. How much gravitational potential energy does the book have? 6.5 joules
4.5 joules
7.5 joules
3.33 joules

7.5 joules .

Explanation:

Hello!

In this case, since the gravitational potential energy is computed by multiplying the exerted force by the distance from the object to the floor:

By plugging in the given 5 N and 1.5 m we obtain:

Thus, the answer would be 7.5 joules .

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it is the most commonly accepted one

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