Use the reaction equation and bond energies to answer the question 2H20 - 2H2 + O2
1
H-O: 467 kJ/mol
H-H: 432 kJ/mol
O=0.495 kJ/mol
What is the total energy of the reaction? Is this an endothermic or exothermic reaction?
(1 point)
O 509 kJ/mol, endothermic
O 509 kJ/mol, exothermic
O-509 kJ/mol, endothermic
-509 kJ/mol, exothermic

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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

there are two significant figures.