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Answered) Calculate the moles of anhydrous (dry) KAl(SO 4 ) 2 that were present in the sample. Step 1: Find the mass of the dry anhydrous salt show work:


A. Calculate the moles of anhydrous (dry) KAl(SO4)2 that were present in the sample.

  • Step 1:  Find the mass of the dry anhydrous salt show work: 
    Final weighing – mass of pan =  mass of anhydrous salt
  • Step 2:  Find the molar mass of KAl(SO4)2 and show work here
  • Step 3:  Find the moles with work shown:  grams of the dry salt divided by the molar mass = moles

B. Calculate the ratio of moles of H2O to moles of anhydrous KAl(SO4)2. Note: Report the ratio to the closest whole number.

  • Show work here:  Take the value of the moles of water and divide by the moles of the salt.  Round to the nearest whole number

C. Write the empirical formula for the hydrated alum, based on your experimental results and answer to Question B.

  • Hint: if the ratio of moles of H2O to moles of anhydrous KAl(SO4)2 was 4, then the empirical formula would be: KAl(S04)2•4H20.  Show your work.

the image uploaded is the table that is needed to answer these questions

 


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