Hello, I have an issue with calculations and I am not sure ,if I get correct answers,because (for example in question 38 my answer is negative) Could you show me calculations and empirical formula? (#2 in data sheet is 16.059) Thank you 36) After you leave the lab, calculate mass of Mg. Take entry 2), “Mass of crucible, lid and Mg” minus entry 1) “Mass of empty crucible and lid”. Record result into Entry 4 37) Calculate mass of magnesium oxide: Take Entry 3, “Mass of Crucible, lid and magnesium oxide” minus Entry 1, “Mass of empty crucible and lid”. Record result in Entry 5. 38) Calculate mass of O: take Entry 5, “Mass of oxide” minus Entry 3 “Mass of magnesium”. Recordresult into Entry 6 39) Convert mass of Mg to moles. Take Mass of Mg, Entry 4, and multiply it by (1 mol / 24 g). Record result into Entry 7 40) Calculate moles of oxygen. Take mass of O, Entry 6, multiply it by (1 mol / 16 g) and record result in Entry 8. 41) Decide which of Entry 7 and 8 is smaller. Write the value into Entry 9 42) Divide number of moles of Mg, Entry 7, by number in Entry 9. Round to a whole number and record in Entry 10. 43) Divide moles of O, Entry 8, by number in Entry 9. Round result to a whole number, and record it in Entry 11. 44) Entries 10 and 11 give you the subscripts in empirical formula of magnesium oxide. Write the formula in entry 12
Hello,
I have an issue with calculations and I am not sure ,if I get correct answers,because (for example in question 38 my answer is negative)
Could you show me calculations and empirical formula? (#2 in data sheet is 16.059)
Thank you
36) After you leave the lab, calculate mass of Mg. Take entry 2), “Mass of crucible, lid and Mg” minus entry 1) “Mass of empty crucible and lid”. Record result into Entry 4
37) Calculate mass of magnesium oxide: Take Entry 3, “Mass of Crucible, lid and magnesium oxide” minus Entry 1, “Mass of empty crucible and lid”. Record result in Entry 5.
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38) Calculate mass of O: take Entry 5, “Mass of oxide” minus Entry 3 “Mass of magnesium”. Recordresult into Entry 6
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39) Convert mass of Mg to moles. Take Mass of Mg, Entry 4, and multiply it by (1 mol / 24 g). Record result into Entry 7
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40) Calculate moles of oxygen. Take mass of O, Entry 6, multiply it by (1 mol / 16 g) and record result in Entry 8.
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41) Decide which of Entry 7 and 8 is smaller. Write the value into Entry 9
-
42) Divide number of moles of Mg, Entry 7, by number in Entry 9. Round to a whole number and
record in Entry 10.
-
43) Divide moles of O, Entry 8, by number in Entry 9. Round result to a whole number, and record it
in Entry 11.
-
44) Entries 10 and 11 give you the subscripts in empirical formula of magnesium oxide. Write the
formula in entry 12.
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