Lab 9 Empirical Formulas Prelab Questions 1. What is the empirical formula of gl

Question

Lab 9 Empirical Formulas Prelab Questions 1. What is the empirical formula of glucose, CH 2.0 2. Magnesiom oxide is made up of magsesium and oxyigen. To sythesize magnesiwm eside, magnesium is placed in a container and heated. Where does the oxypen come trom -3. In Part A, where des the water ia the lest tube eome from? 4. In Part B, why is water added to the ash residue and thern heated? 5. A 1S58-g sample of hydrated magnesium sulfate (MgSO,) is heated to leave a residue weighing 7.61 g. (MgsO,7H,o) What is the formula of the hydrate? 6. A 2.34g sample of copper dust is placed in a 24.62-g crucible and heated red hot to form a copper . oxygen compound. After heating, the crucible and product weigh 27.55 g. What is the empirical formula of this copper-oxygen compound?

Explanation / Answer

Ans 1 : The molecular formula of glucose is C6H12O6.

Empirical formula shows the proportions of elements which are present in the compound . The formula does not show the actual number of atoms or arrangement of these atoms in the compound.

So here the proportion of elements is 1 :2 :1 , so the empirical formula of glucose will be CH2O.

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