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Calculate heat of reaction in kJ per mole of KHCO3(s) for the reaction of potassium bicarbonate and hydrocholric acid. Assume specific heat of the solution is same as that of water and qcalorimeter is negligible. mass KHCO3=3.99g mass HCl=50.91 ΔT=-5.4 degress C
She claims that the uncertainty of the bacterium's position is greater than the microscope's viewing field, and the bacterium is thus impossible to locate. What is the uncertainty of the position of the bacterium?
Draw resonance contributors for the following: indicate major and minor contributors to hybrid
A current of 10.0 amps flows for 2.00 hours through an electolytic cell containing a molten salt of mental X. This results in the decomposition of 0.250 mole of metal X at the cathode. The oxidation state of X in the molten salt
A researcher plans to compare two treatment conditions by measuring one sample in treatment 1 and a second sample in treatment 2. The researcher will then compare the scores for the two treatments.
how glycine buffers solutions at either pKa by consuming small amounts of added hydrogen or hydroxide ions
in a test tube containing a precipitate ofpboh2 in water will the ions from the salt havea reasonable concentration?
consider 100 ml of 10 solute and 10 ml of 50amp solute. which has the greatest concentration of solute? what is the
What is the age of a rock whose Argon 40 / Potassium 40 ratio is 1.55? The half life of Potassium 40 is 1.28 x 10^9 years.
What one reagent should re-energize the light solution after it has faded? Explain using moles and limiting reagents.
Walking fast can consume 5.0 kcal per minute. How many hours of exercise are required to consume 450 kcal, the energy in a large candy bar
A 1.00L solution containing 3.50x10^-4M Cu(NO3)2 2.20x10^-3M ethylenediamine(en). The kf for Cu(en)2+ is 1x10^20. What is the concentration of Cu2+(aq) in the solution
What is the pH of a solution made by adding 6.21 grams of sodium fluroide, NaF, to 391 mL of 0.317 M hydrofluoric acid, HF? (Assume no change in volume takes place.)
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