1. The number of atoms on each side of the following reaction is CH4+ 202 C02 2H
ID: 554838 • Letter: 1
Question
1. The number of atoms on each side of the following reaction is CH4+ 202 C02 2H20 is a) 5 b) 6 d) 9 2. The total mass of the products in the reaction in question #1 is a) 80 grams b) 64 grams c) 62 grams d) 48 grams In the space provided write a balanced reaction for the reaction between nitrogen and fluorine to make nitrogen trifluoride. 3. 4. In the space provided write a balanced reaction for the reaction between hydrochloric acid and calcium hydroxide. 5. A sample of phosphorus trichloride(PCL) contains 1.4 moles of the substance. How many atoms are there in the sample? a) 5.6 b) 8.43 x 1023 d) 3.37 x 1024 6. Why is acetic acid classified as a weak acid? a) it does not ionize in water. b) It does not neutralize bases. c) It gives vinegar a sour taste. d) It ionizes slightly in water. 7. In a titration experiment, 18.62 mL of 0.0975 M HNOs (nitric acid) was needed to completely neutralize 20.0 mL of a potassium hydroxide solution. What was the concentration the KOH solution. a) 0.00191 M b) 0.00382 M c) 0.0908 MExplanation / Answer
1. OPTION D. In each side of the equation, the atoms involved are constant as dictated by law of mass conservation. In each side there is 1 C, 4 H and 4 O atoms giving a total of 9 atoms per side.
2. OPTION A. The products contain 1 mole of carbon dioxide and 2 moles of water whose molar masses are 44 and 18 respectively. This gives 44 + (2x18) = 80g.
3. Nitrogen trifluoride can be prepared from the nitrogen and fluorine gases by electrical discharge. The reaction is given as N2 + 3F2 -----> 2NF3
4. Ca(OH)2 + 2HCl -----> CaCl2 + 2H2O
5. OPTION B. 1 mole of any substance contains Avagadro's number of molecules or atoms. Thus, 1.4mol will contain 1.4x6.023x1023 = 8.43x1023.
6. OPTION D. Acetic acid in water does not ionize completely into acetate anion and protons. Thus an equilibrium between acetic acid is always established with protons and acetate ions in water. This incomplete ionization is why acetic acid is classified as a weak acid. Strong acids undergo complete ionization.
7. OPTION C. The law of conservation of mass in a reaction gives that a certain volume of a substance of certain concentration requires the same quantity of the other reactant to achieve complete reaction to give product. In this case, this law of equivalence can be put mathematically as VaMa = VbMb which implies Mb = (VaMa)/Vb = (18.62x0.0975)/20 = 0.0908M
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