Chem1A-Fa10-Test3Practice

Chem1A-Fa10-Test3Practice - Test 3 Practice Problems Chem...

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Test 3 Practice Problems Chem 1A Fall 2010 Mr. J. Fassler Composition of Compounds 1. a. Palmitic acid is a fatty acid derived from palm oil. Analysis shows that palmitic acid s 74.94% C, 12.58% H and 12.48% O. What is the empirical formula of palmitic acid? b. If the molar mass of palmitic acid is 256.43 g/mol, what is its molecular formula? Stoichiometry 2. a. Stomach acid is acidic because it contains hydrochloric acid (HCl). Write a balanced equation for the reaction of HCl and magnesium hydroxide (an antacid). b. How many grams of magnesium hydroxide are needed to neutralize 0.150 L of 0.100 mol/L HCl?
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3 ) and I 2 . 2 NH 3 (l) + 3 I 2 (s) NI 3 (s) + 3 HI a. If 1.235 g NH 3 and 10.57 g I 2 are reacted, what is the theoretical yield of NI 3 ? b. If 4.875 grams of NI 3 were collected from the reaction, what would the percent yield for the reaction be? 4.
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Chem1A-Fa10-Test3Practice - Test 3 Practice Problems Chem...

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