The diagram below shows a laboratory setup. In the diagram, flask A contains a mixture of two liquids. This flask is being heated, which is causing alcohol in the mixture to evaporate and recondense into flask B. Flask B contains pure liquid alcohol. What does this demonstrate? A. Mixtures form when pure substances chemically react to form new substances. B. Liquids must be heated until both substances are gases in order for a mixture to form. C. Mixtures can be separated into their component parts through physical processes like boiling. D. Liquids can only form mixtures with other liquids.

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the answer would be b i believe

i do not get it   at all

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