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A substance, X, has the following properties. (Size of mass is 250. g.) Specific Heat Capacities: ?Hvap 20. kJ/mol C(s) 3.0 J/g·°C ?Hfus 5.0 kJ/mol C(l) 2.5 J/g·°C bp 75°C C(g) 1.0 J/g·°C mp -15°C Calculate the energy that must be removed to convert substance X from a gas at 119°C to a solid -47.9°C. Assume X has a molar mass of 75.0 g/mol.
A 2.0 L tank at 298 K contains oxygen gas with a partial pressure of 3.8 atm and helium gas with a partial pressure of 5.2 atm.
Does the presence of water vapor affect the result? Explain why it does or does not have a large affect on the value obtained.
If 72.4 kJ of heat is supplied to a 842 g block of metal, the temperature of the metal increases by 9.0°C. Calculate the specific heat capacity of the metal in J/g·°C.
A solution of 350mg of optically active 2-butanol in 10 mL of water, placed in a 20 cm cell shows an optical rotation of +6 .24 degrees. What is the specific rotation of this compound
Combine the three equations from below to show the overall reaction for the products for the starch-triiodide complex. 1) NaOCl (aq) + HCl (aq) ----> HOCl (aq) + NaCl (aq) 2) HOCl (aq) + HCl (aq) + 3 I^ - (aq) -----> I3- (aq) + 2 Cl- (aq) + H2O (l..
The molar solubility of a salt with the general forumula. M2Q, is 2.3 x 10^-3 mol/L. A. What is the Ksp of the salt?. What is the free energy change for the dissolution of the salt at 25C?
The heat evolved when a mole of octane undergoes complete combustion is 1303 kcal. This is called the heat of combustion. How many kcal of heat wil be generated when 148 grams of octane react with 952 grams of oxygen? Show calculations.
A beaker with 175 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.60 mL of a 0.340 M HCl solution to the beaker
The rate constant for a certain reaction is k = 1.50×10?3 s^-1 . If the initial reactant concentration was 0.650M , what will the concentration be after 13.0 minutes?
What is the net charge on glucose 6 phosphate at pH 7.2? the pK's for glucose-6-phosphate are 0.9 and 6.0.
The MnO4(-) is often used to analyze for the Fe(2+) content of an aqueous solution via the reaction MnO4(-) + Fe(2+) ---> Fe(3+) + Mn(2+) in acidic solution. What is the ratio of Fe(2+):MnO4(-) in the balanced equation
a saline solution contains 150 mEq/L each of Na+ and Cl- how many moles of Na+ and Cl- are in 2.50L of the solution
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