In a neutralization reaction between a strong acid and a strong base, which of t

Question

In a neutralization reaction between a strong acid and a strong base, which of the following chemical species undergo a. HOH and H b. OH and H C. HOH and OH d. HOH and H:O e. None of the above. 6, what is the empirical formula for a compound that is 46.16% carbon, 5.16% hydrogen and 48.68% fluorine? a. C3H4Fa b. CHF C. CH2F d. CH2F e. None of the previous answers 7. A second experiment on the compound from Question 6 found that it has a molecular weight of 144 g/mol. What is its molecular formula? a. C3H4F2 b. CsHioFs C. CoH&F; d. C6H&F; e. None of the previous answers 8. Which of the following molecules is held together by only covalent bonds? a. NaBr b. CH4 C. KCI d. K2Cr20 e. None of the above. 9. A bottle in the lab is filled with a liquid and is labeled as Na COs(aq). Based on this information, how many ions are present in solution for every one formula unit? a. Na, C, and O b. 2 Na, CO32 c. Na21 ,CO32 d. Na, co32, H20 e. None of the above.

Explanation / Answer

5. OH^- (aq) + H^+ (aq) --------> H2O net ionic equation of strong acid and strong base
b. OH^- and H^+
6.
Element      %       A.Wt    relative number       simple ratio          simplest ratio
C           46.16     12       46.16/12 = 3.85       3.85/2.56   = 1.5    1.5*2 = 3
H           5.16       1        5.16/1   = 5.16      5.16/2.56   = 2        2*2 = 4
F           48.68     19       48.68/19 = 2.56      2.56/2.56 = 1         1*2 = 2
   The empirical formula = C3H4F2
a. C3H4F2
7.molecular formula = (empirical fromula)n
           n         = M.Wt/E.F.Wt                   { E.F.Wt of C3H4F2 = 77g/mole]
                     = 144/77   = 2
molecular formula + (C3H4F2)2 = C6H8F4
c. C6H8F4
8. b.CH4
9.b.2Na^+, CO3^2-
                                                

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