Which of the following statements best describes why creating a hypothesis is an important step in a scientific investigation? *

A. The hypothesis is actually the first step in the scientific method.
B. The hypothesis guides the researcher towards the results of the experiment.
C. The hypothesis provides the steps needed to analyze the data to reach conclusions,
D. The hypothesis provides a prediction about what might happen during the experiment
based on prior research.
Students are studying the effects of beach pollution by counting

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

points

explanation: