need help to solve pre and post lab questions for lab chemis

need help to solve pre and post lab questions for lab chemistry. for example the next experiment ‘Determination of empirical formulas.’ I need answers for post-lab question only for lab 4, and a pre-lab Post lab questions for lab 5Please look at the PDF next, it has all labs. I need answers for pre and post lab question only. I need perfect answers, no plagiarism, you can type on the pdf file under each question.