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The heat of vaporization of methanol, CH3OH, is 35.20 kJ/mol. Its boiling




point is 64.6°C. What is the change in entropy for the vaporization of




methanol?

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A solution of HCl is known to be 0.5622 N. When titrated against KOH, 45.22 ml of the acid neutralized 48.23 ml of the base. Calculate the N of the base.



 


What is the pH of the solution containing 0.20 M NH3 and 0.15M NH4Cl?


Given the equation 10 Na + 2 NaNo3. ------ 6 Na2O + N2



How many grams of NaNo3 must be reacted in order to produce 4.5 g of Na2O?




Given the equation 6 K + B2O3----- 3 K2O + 2B



How many grams of B will be produced if you react 6.25 g of K are reacted?





Given the equation 10 Na + 2 NaNO3--- 6 Na20 + N2



How many grams of Na must be reacted in order to produce 30g of Na2O?




Given the equation 6K + B2O3 ---- 3 K2O + 2B



If i react 2.5 g of B2O3 How many grams of B will be produced?





Given 2 H3PO4 + 3 Mg(Oh)2---Mg3(PO4)2 + 6 H2O



If you react 2.75 g of Mg(OH)2 you will produce how many grams of H2O?





Given 2 H3PO4 + 3 Mg(OH)2 --- Mg3(PO4)2 + 6 H20



How many grams of H3PO4 must be reacted in order to produce 0.33 g of H2O?




Given 2 H3PO4 + 3 Mg (OH)2---Mg(PO4)2 + 6 H2O



How many grams of H3PO4 must be reacted with 10.55 g of Mg (OH)2?





Given 2 H3PO4 + 3 Mg (OH)2 --- Mg3 (PO4)2 + 6 H2O



How many grams of H2O will be produced in the same reaction that produces 2.68 g of Mg3 (PO4)2?




Given the Equation 6K + B2O3. 3K2O + 2B


How many grams of K2O will be produced whe you react one 3.5 g of B2O3

The normal boiling point of C6H5Br is 156.15 celsius . Using Trouton’s Rule find the


vapor pressure at 100 Celsius and compare with the observed value of 141.1 mm Hg.

Calculate the pH of the following acid or base.

  1. A 0.010 M HCl solution


pOH = 

pH =




  1. A 0.010 M HCl solution


pOH = 

pH =



What happened to the number of moles in a sample that originally occupied



500mL with 3.50 moles and then occupied 700 ml?

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