practiceexam16 - 1 City College Chemistry Department...

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Unformatted text preview: 1 City College, Chemistry Department Chemistry 10301, sections T and T2, Prof. T. Lazaridis Final exam, Dec 21, 2006 Name (last name first): _____________________________________________ I.D. Number: ______________________________________________________ Workshop leader:__________________________________________________ Note: There are 18 questions in this exam. Fill in your answer in the blank space provided immediately following each question. 1/2 point will be subtracted every time you report a numerical result with an incorrect number of significant figures. A Data Sheet with useful information is at the end. 1. (4) Write the names of the elements below next to their atomic symbols: Ga Gallium Co Cobalt Sn Tin Na Sodium 2. (4) Write the molecular formula next to the names of the following compounds: Ammonium Bromide NH 4 Br Potassium Chlorate KClO 3 Magnesium Sulfite MgSO 3 Sodium Phosphate (Na) 3 PO 4 3. (8) Balance the following chemical equations: CaCO 3 + H 2 O + CO 2 Ca(HCO 3 ) 2 (already balanced) 2 AgNO 3 + K 2 CO 3 Ag 2 CO 3 + 2 KNO 3 XeF 6 + 3 H 2 O XeO 3 + 6 HF 2 H 2 S + 3 O 2 2 SO 2 + 2 H 2 O 2 4. (8) How many grams of oxygen are required to burn 75.0 g of ammonia? The reaction is 4 NH 3 + 5 O 2 4 NO + 6 H 2 O Molar mass of ammonia: 14.00+3X1.008= 17.02 g/mol Molar mass of O 2 : 16.00X2 = 32.00 g/mol moles of NH 3 : 75.0 g/ 17.02 (g/mol) = 4.41 mol moles of O 2 required: 4.41 mol NH 3 X 5 mol O 2 / 4 mol NH3 = 5.51 mol convert to grams: 5.51 mol X 32.00 g/mol = 176 g O 2 5. (5) A 2.122 g sample of an unknown cobalt compound is dissolved in 50.0 mL of water....
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This note was uploaded on 07/21/2011 for the course CHEM 111 taught by Professor Sawyers during the Spring '11 term at Virginia College.

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practiceexam16 - 1 City College Chemistry Department...

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