# 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

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 M29. 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 mol27. 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 formula19. 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( )TiO20. Which is the formula for tetraphosphorus hexoxide? (Points : 4) ( )P5O6( )P4O6( )P4O5( )P5O7

28. If 1.22 g of sodium sulfate, Na2SO4 (formula mass = 142.0 g/mol) are dissolved in enoughwater to make 100.0 mL of total solution, what is the molarity of this solution? (Points : 4)( )0.345…

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