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28. If 1.22 g of sodium sulfate, Na2SO4 (formula mass = 142.0 g/mol) are dissolved in enough water to make 100.0 mL of total solution, what is the molarity of this solution? (Points : 4) ( )0.345 M ( )0.0859 M ( )0.345 m ( )1.22 M 29. Which statement about solutions is not true? (Points : 4) ( )A solution is any homogeneous mixture containing two or more substances. ( )The two fundamental substances that make up a solution are the solute(s) and solvent. ( )The solvent is the component in the majority. ( )If the solute doesn't dissolve in the solvent at all, this is a supersaturated solution. 30. A chemist is producing copper(II) chloride using the following reaction: Cu(s) + Cl2(g) --> CuCl2(s) In one reaction, the chemist uses 15.0 g of copper metal and 10.0 g of chlorine gas as reactants. When the reaction reaches completion, 16.0 g of copper(II) chloride has been produced. What was the percent yield of the reaction? (Points : 4) ( )62.5% ( )45.1% ( )84.4% ( )93.7% 26. How many moles of iodine are produced from 7.00 moles of chlorine, according to the equation shown? 3Cl2(g) + 2FeI2(s) --> 2FeCl3(s) + 2I2(g) (Points : 4) ( )4.67 mol ( )10.5 mol ( )4.4 mol ( )1185.25 mol 27. Usng the following balanced chemical equation, determine the limiting reactant in the reaction between 3.0 grams of titanium and 8.0 grams of chlorine gas? Ti(s) + 2Cl2(g) --> TiCl4(s) (Points : 4) ( )Cl2 ( )TiCl4 ( )Ti ( )In this reaction, there is exactly the stoichiometric amount of each reactant. 24. Lucite is 71.4% carbon, 9.59% hydrogen, and 19.01% oxygen. What is the empirical formula for Lucite? (Points : 4) ( )C5H8O ( )C89HO31 ( )C7HO2 ( )The formula cannot be determined with only this information. 18. C2H2 is a chemical formula for acetylene. Which type of chemical formula is this? (Points : 4) ( )A molecular formula ( )An empirical formula ( )A structural formula 19. Titanium will form the cation Ti4+. What is the formula for the ionic compound titanium(IV) oxide, the white pigment in paint? (Points : 4) ( )TiO4 ( )Ti2O ( )TiO2 ( )TiO 20. Which is the formula for tetraphosphorus hexoxide? (Points : 4) ( )P5O6 ( )P4O6 ( )P4O5 ( )P5O7
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28. If 1.22 g of sodium sulfate, Na2SO4 (formula mass = 142.0 g/mol) are dissolved in enough
water to make 100.0 mL of total solution, what is the molarity of this solution? (Points : 4)
( )0.345...