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CsF has a lattice energy -744kJ/mol . Consider a hypothetical salt XY. X^3+ has the same radius of Cs^+ and Y^3- has the same radius as F^- . Estimate the lattice energy of XY
At what temperature will air (MW=29) have the same density as helium at 300 K, both gases at the same pressure.
Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the C^14 has decayed to 1/16.0 of the original amount. How long ago was this plant alive. Express your answer numerically in years.
A doctor prescribes 3 g of a drug, daily, for a patient. The pharmacist has only 750-mg tablets available. How many tablets will the patient take daily
Calculate whether soils in the region are subject to excessive sulphate loading if the only source of sulphate is rainfall and if the recommended maximum is set at 20 Kg SO4-2 ha-1.
A semipermeable membrane is placed between the following solutions. Which solution will decrease in volume? Solution A: 1.31% (m/v) starch Solution B: 7.48% (m/v) starch
Hydrazine, N2H4, is used as a rocket fuel. In the reaction below, if 80.1 g of N2H4 and 92.0 g of N2O4 are allowed to react, which is the limiting reactant?
A patient weighs 165 pounds and is to receive a drug at a dosage of 45.0 mg per kg of body weight. The drug is supplied as a solution that contains 25 mg of drug per mL of solution. How many mL of the drug should the patient receive?
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
The valve between a 5-L tank containing a gas at 9 atm and a 10-L tank containing a gas at 6 atm is opened. Calculate the final pressure.
Use enthalpy of formation data to calculate the number of moles of CO2(g) produced per megajoule of heat released from the combustion of each fuel under standard conditions
A sample of helium gas occupies 1045 mL at 621 mmHg. For a gas sample at a constant temperature, determine the volume of helium at 745 mmHg.
What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl2 are mixed with 42.0 mL of 0.600 M (NH4)2S? Aqueous ammonium chloride is the other product.
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