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The acid-dissociation constant for an acid-base indicator HIn is 0.0000438. At 600 nm, the molar absorptivities are 2230 for HIn and 8900 for In-. Calculate the absorbance at 600 nm of a 1.00 x 10-4 M solution of the indicator at pH 4.81 in a 1.00-cm cell.
How many molecules of substance B are produced when 30.0 g of substance A reacts? The molar mass of substance A is 23.5 g/mol. A) Convert the mass of A to moles
Describe the procedure for conducting a melting point experiment. Include the names of the equipment used and the observations you could expect to make.
the boiling point of a solution containing 10.44 g of an unknown nonelectrolyte in 50.00 g of acetic acid is 159.2degc.
calculate the change in H, change in G and K (at 298) for the production of ozone from oxygen: 3O2(g) goes to 2O2(g) at 30 km above the surface of the earth the temperature is about 230 K and the partial pressure of oxygen is about 1.0 x 10^-3 atm
At 4.00 L, an expandable vessel contains 0.864 mol of oxygen gas. How many liters of oxygen gas must be added at constant temperature and pressure
What is the de Broglie wavelength of a flea midway through its jump? Assume the mass of the flea is4.50×10-4 g and t is moving at 1.00 m/s.
here why is the -NHCOCH3 group less activating in electrophilic substitution compared to the -NH2 group
a gas in a sealed container has a pressure of 125 kpa at a tempurature of 30.0 degrees celcius. if the pressure in the
What is the equilibrium constant, K, of the following reaction given the following equilibrium conditions
Consider the following endothermic reaction at Equlibrium; 2 H20(l) 2H2(g)+O2(g) if .5 mol water is added what will happen and why
a storage container has the dimensions of 232mm by 0.145m by 32.5cm. If it is filled with liquid mercury (density 13.534 g/ml), what is the mass in kg of the mercury in the container
A solution of calcium ions contains 5 meq/650. cm3 of calcium ion. How many moles of calcium ion does this solution contain?
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