Directions: Select the choice that best fits each statement. The following questions(s) refer to a pond in southern Canada. In 1950 the pH of the pond water was 8.2, but by 2000 the pH had decreased to 5.2. An effective short-term remediation strategy for the pond would be to build taller smokestacks downwind from the pond A prevent fertilizer runoff from entering the pond B periodically stock the pond with brown trout C add calcium carbonate to the pond water D use tertiary wastewater-treatment protocols

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

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;