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Compute the standard enthalpy of formation of gaseous diborane (B2H6) using the following thermo chemical information:
4B (s) + 3O2 (g) ==> 2B2O3 (s) change in H= -2509.1 kJ
2H2 (g) + O2 (g) ==> 2H2O (I) change in H= -571.7 kJ
B2H6 (g) + 3O2 (g) ===> B2O3 (s) + 3 H2O (I) change in H= -2147.5
While in Europe, if you drive 105 km per day, how much money would you spend on gas in one week if gas costs 1.10 rm euros per liter and your car's gas mileage is 41.0 mi/gal? Assume that 1; rm euro = 1.26; dollars.
A solution of .25 mol HF diluted to 1.0 L has a hydronium ion concentration of 1.3x10^-2 M. What is the percent ionization of HF
Could someone please help me with this post lab question fororganic chemistry. Draw the structure of the triglyceride formed from oleic acid,linoleic acid, and stearic acid
When a 60.0 g sample of a metal at 100.0oC is added to 45.0 g of water at 22.00 oC, the final temperature of both the water and metal is 32.81 oC. The specific heat of water is 4.184 J/g·K. What is the specific heat of the metal
calculate the heat evolved by burning one mole of a c20h40 if a 0.50 gram samplecauses the temperature of 2.50 kg of
Calculate the partial pressure of propane in a mixture that contains equal masses of propane (C3H8) and butane (C4H10) at 20.0 °C and 738 mm Hg.
This strontium isoptope is radioactive, with a half-life of 28.1 years. Calculate how long (in years) it will take for 5.63g of the isotope to be reduced to .354g by decay
A student used 22.0 mL of 0.1035 M NaOH to titrate 20 mL of orange juice. How many grams of citric acid were present in the sample? The molar mass of citric acid, H3C6H5O7, is 192.12 g/mol.
A steel tank has a volume of 438 L and is filled with 0.885 kg of oxygen. calculate the pressure of oxygen at 69.8 fahrenheit.
the pressure of 4.90 liters of an ideal gas in a flexible container is decreased to one- third of its original pressure
the manager of a small chemical plant receives an order for 2000 kg of a 30 solution by weight of phosphoric acid in
you have a 10.40-g mixture of table sugar c12h22o11 and table salt nacl. whenthis mixture is dissolved in 150. g of
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