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Ammonia and preheated air are mixed to form a gas containing 15.0 mol% NH3 at 500°C. If ammonia enters the mixing unit at 30°C at a rate of 600 kg/h and heat is lost from the mixer to its surroundings at a rate of 12.00 kW, determine the temperature to which the air must be preheated.
When 28.0 ml of 0.500 M H2SO4 is added to 28.0 ml of 1.00 M KOH in a coffee-cup calorimeter at 23.50 degrees Celsius, the temperature rises to 30.17 degrees Celsius. Calculate the delta H of this reaction.
An unknown compound X, is thought to have a carboxyl group with a pka of 2.0 and another ionizable group with a pka between 5 and 8. When 75 ml of 0.1 M NaOH was added to 100 ml of a 0.1 m solution of X at pH 2.0, the pH increased to 6.72.
Calculated the volume of 1 M solution of HCl needed for 1 unit shift of the pH of the following solutions
how long will it take for the concentration of A to decrease from 1.0 M to 0.25 M? If [Bo] = 1.5 M, what will be the concentration once [A] = 0.25 M?
a sealed balloon is filled with 1.70 l of helium at 23degc and 1.00 atm. the balloon rises to a point in the atmosphere
Careful spectral analysis shows that the yellow light of the sodium lamp is made up of photons of two wavelengths, 589.0 nm and 589.6 nm. What is the difference in energy (in joules) between photons with these wavelengths?
Write the balanced molecular, ionic and net ionic equations for the reaction between magnesium and cobalt(II) sulfate. (b) What is oxidized and what is reduced in the reaction?
an empty vial has a mass of 67.77 g. if the vial has a mass of 244.56 g when completely filled with liquid carbon
what will the concentration be after 3.00 minutes? B)A zero-order reaction has a constant rate of 3.40×10^?4 M/s . If after 80.0 seconds the concentration has dropped to 3.00×10^?2 M , what was the initial concentration?
Describe the preparation of a 1.50 M, pH 8.0 tris buffer (500 mL) using tris base (MW= 121.1 g/mol) and 3.0 M HCl. pKa of tris is 8.3
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.120 M HCIO (aq) with 0.120M KOH (aq)
Calculate the pH after 100.0 mL of KOH has been added. pH=____. 2. Calculate the pH after 150.0 mL of KOH has been added
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