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A 0.115 M solution of a weak acid (HA) has a PH of 3.33. Calculate the acid ionization constant (Ka) for the acid.
From the number if moles of ammonia calculated in part (a - below) determine the number of micrograms of mitrogen per gram of dry soil. Assum you have 2.753 f of soil and all of the ammonia diffused from the soil.
Calculate the quantity of gas, in moles, if 127 L at 55.0 C has a pressure of 11.35 kPa.
A 250 g yo-yo is swung on the end of a50 cm string at a constant speed of 4 m/s. What is the centripetal force acting on the yo-yo?
what is the average density of the sun in units of grams per cubic centimeter? The volume of a sphere is (4/3)?^3.
Compute the band gap for this semiconductor material after Consideing an intrinsic semiconductor with a conductivity σ that triples between the temperature 27 degree Celsius and 57 degree celsius.
Which of the following pairs of substances are miscible and which are not?
A 1L flask is filled with 1.00 g of argon at 25 C . A sample of ethane vapor is added to the same flask until the total pressure is 1.20 atm. What is partial pressure of Argon and ethane in the flask?
The products of a specific reaction and the side products or impurities? Explain specifically what would be observed for this pair of compounds: 4-bromoacetanilide and 2-bromoacetanilide
Estimate the enthalpy change for the reaction between 1 mol c2h5oh as liquid ethanol, a fuel made by fermenting corn
Magnesium has three naturally occurring isotopes, 24Mg (isotopic mass = 23.9850 amu, abundance 78.99%), 25Mg (isotopic mass = 24.9858 amu, abundance 10.00%), and 26Mg (isotopic mass = 25.9826 amu, abundance 11.01%)
Calculate the amount of solution that contains 8.0g calcium cloride (CaCl2) from 35% solution of CaCl2?
A sample of lead releases 221 kJ of heat when freezing. What is the mass of the sample? DHfus = 23 J/g
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