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<center>Homework Set #5 (Chapter 1-3)</center> <br> <i>(You will need to use a separate sheet of paper for each problem. Please show all work especially units & sig figs)</i><br> <br> 1. Washing soda, a compound used in laundry, is a hydrate whose formula can be written as Na<sub>2</sub><nowiki>CO</nowiki><sub>3</sub>xH<sub>2</sub>O where x is the number of water per mole of Na<sub>2</sub><nowiki>CO</nowiki><sub>3</sub>. When a 2.558g sample of washing soda is heated at 125 degC, all of the water of hydration is lost, leaving 0.948g of the Na<sub>2</sub><nowiki>CO</nowiki><sub>3</sub>. What is the value of x?<br> <br> 2. A student took an unknown sample mass of a compound that consists of Ti and Cl and put it into some water. The Ti formed Ti<nowiki>O</nowiki><sub>2</sub>, which was removed, dried and found to weigh 0.777g. <nowiki>AgNO</nowiki><sub>3</sub> was then added to the solution until all of the Cl<sup>1-</sup> ions were converted to 5.575g of <nowiki>AgCl</nowiki>. Determine the empirical formula of the compound of Ti and Cl.<br> <br> 3. An impure sample of zinc is treated with excess of sulfuric acid to form zinc sulfate and hydrogen gas. Write the equation for the reaction. If 0.0764g of H<sub>2</sub> is obtained from 3.86g of the sample, calculate the percent purity of the sample. What assumption must you make?<br> <br> <br> Answers at HomeworkSet5Answers
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