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Suppose that 1.431 g of impure Ba(OH)2 is dissolved in enough water to produce 196 mL of solution and that 39.5 mL of this solution is titrated to the stoichiometric point with 12.3 mL of 0.0611 M HCl(aq). What's the percent purity of the original sample?
An unknown compound has the formula CxHyOz. You burn 0.220 g of the compound and isolate 0.312 g of CO2 and 0.191 g of H2O.
The density of Hg (l ) is 13.6 g/mL. Compare this heat energy transfer with the amount needed to vaporize 0.500 mL water. See Table 11.2 for the molar enthalpy of vaporization of H2O.
If the molecular weight of a molecule is 180, how many grams would be required to make 100 milliliters of a 2 molar solution
What is the entropy change for freezing 4.25 g of C2H5OH at 158.7 K? H = -4600 J/mol. Answer in units of J/K.
Derive the activation energy for a reaction that proceeds 2 times faster when the temperature is raised from 20 C to 30 C.
Chlorine can be generated by heating together magnesium hypochlorite and hydrochloric acid. Magnesium chloride and water are also formed.
If a procedure calls for 2.0mL of concentrated nitric acid, what are the mass and moles of HNO3 actually used in the reaction
What mass of this substance must evaporate in order to freeze 250 of water initially at 25? (The heat of fusion of water is 334 the specific heat of water is 4.18 .)
The C-H bond and the C-halogen bond are broken in the same step. Alkyl bromides generally react faster than alkyl iodides.
When 7 mL of a solution containing 3 M KNO3 is diluted to 21mL, a dilute solution is formed. What is the NO3- concentration in 10mL of the dilute solution?
Calculate the standard enthalpy change, the standard entropy change, and the standard free energy change for the reaction: N2 (g) + 3 F2 (g) ? 2 NF3 (g) How will the sign of ?G change as the temperature increases
Calculate the work done if a gas is compressed from 8.1 L to 3.9 L at constant temperature by a constant pressure of 2.3 atm, and give your answer in units of joules.
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