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What is the positional entropy at absolute zero for two moles of CF3Cl?
1. 23 J/K2. 5.7 J/K3. 8.3 J/K4. 11.5 J/K5. 0 J/K
How much limestone must be decomposed by heating to produce 150.0 grams of lime, CaO?assuming that the limestone contains 85.0% pure CaCO3.
How many moles of CO(NH2)2 are present in 150 g of water, if the freezing point of the solution is -4.02C? kf(water) = 1.86 K · kg/mol.
What volume will 454 grams (1 lb) of hydroigen occupy at 1.05 atm and 25 C.
A 1.00 L balloon filled with nitrogen at 25 ° C and 765.3 torr is moved to a closed vessel with the pressure now at 659.3 torr and temperature 25 ° C.
Calculate how long it will take for 0.500 g of the isotope to be reduced to 0.150 g by decay.
What are the concentrations of HSO4-, SO42-, and H+ in a 0.27 M KHSO4 solution? (Hint: H2SO4 is a strong acid; Ka for HSO4- = 1.3 10-2.).
Calculate the pH of a 0.50 M aqueous solution of NH3. The Kb for NH3 is 1.8 x 10-5.
The pKa of phenol is 9.89. What is the Ka of phenol?
An odorous gas emitted by a hot spring was found to diffuse 2.92 times slower than helium. What is the molar mass of the emitted gas.
a sample of oxygen occupies 178 mL in a cylinder shown at a barometric pressure of 734 torr and 25 degrees Celcius. If the piston is pushed in and compresses the oxygen sample to 134 mL, what is the pressure (in torr) of the gas?
If 0.80 g of gas occupies 295mL at 25 degrees Celsius and 680 mm Hg of pressure, what is the molar mass of the gas?
A 4.07 L sample of H2O(g) reacts at a temperature of 375°C and a pressure of 679 mm Hg. How many grams of NH3 can be produced?
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