I saw two birds land on the roof of our porch. One bird had a twig in its beak. The other bird had a piece of string. Which sentence could be added to the passage to best vary the sentence pattern and affect the fluency? I think they were a male and female robin. Then they flew to the corner of the porch. I sat quietly and watched as they began to build a nest. Without a care, the little carpenters got to work on a nest.

d i think if not ill fix it

Explanation:

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