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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
a certain mass of oxygen was collected over water when potassium chlorate was decomposed by heating. the volume of the
What is the approximate ratio of the molar concentrations of CO_2(aq) in the soda before it is opened to that in the soda after it has been opened and reached equilibrium with the surrounding atmosphere
A sample of propane,C3H8 , contains 18.0 moles of carbon atoms. How many total moles of atoms does the sample contain? Express the total number of moles of carbon and hydrogen numerically.
The equilibrium constant willYet another reaction has an equilibrium constant at 25 . It is an exothermic reaction, giving off quite a bit of heat while the reaction proceeds. If the temperature is raised to 200 , what will happen to the equilibri..
what is the partial pressure of nitrogen in a container that contains 3.96mol of oxygen 7.49 mol of nitrogen and 1.19
For a hypothetical gas-phase reaction that is second order in A and third order in B, by what factor does the rate change if pA is decreased by 4 times and pB is doubled
a calorimeter contains 29.0 grams of waterh2o at 11.5 degree celsius temperature . when 1.90 grams of a substance with
How much of a 500 mL bottle of 1.00 molar KCl solution should be diluted with deionized water to give 200.0 mL of a 0.100 molar solution that is required for an incredibly expensive enzymatic analysis
when 79.272 cg of nitrogen gas is reacted with 79.272 cg of hydrogen gas how many grams of ammonia are
Consider the following cell: Pt|H2(g, 0.645 atm)|H (aq, ? M)||Ag (aq, 1.00 M)|Ag(s) If the measured cell potential is 1.20 V at 25 °C and the standard reduction potential of the Ag /Ag half-reaction couple is 0.80 V, calculate the hydrogen ion con..
Predict the products of each precipitation and acid / base reaction. Balance the completed equation, and then write the net ionic equation. Name the reactants and the products.
give an example of a metabolic pathway of a drug or endogenous substance for each of the following reaction types and
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