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Measurements of strontium in enamel from extracted wisdom teeth were done by atomic absorption spectroscopy. Solutions were prepared with a constant total volume of 10.0 mL containing 0.750 mg dissolved tooth enamel plus variable concentrations of added Sr. Added Sr Signal (ng/mL = ppb) (arbitrary units) 0 28.0 2.50 34.3 5.00 42.8 7.50 51.5 10.00 58.6 1) Find concentration of Sr in tooth enamel in parts per million (micrograms Sr per gram tooth) 2) Find 95% confidence interval for Sr in tooth enamel
Zinc chloride (ZnCl2) is 52.02% chlorine by mass. What mass of chlorine is contained in 65.0 g of ZnCl2?Answer in units of g.How many moles of Cl is this?Answer in units of mol.
What type of reaction occurs prior to the substitution reaction to form a new good leaving group? And please explain why? a. nothing b. an acid base reaction
When ammonia is burned in oxygen, free nitrogen gas and water are produced. What volume of ammonia will react completely with 25.0 L of oxygen.
Acetylene, C2H2, will burn in the presence of oxygen. 2C2H2(g)+ 5O2(g) -> 4CO2(g)+ 2H2O(g) how many grams of water can be produced by the reaction of 2.40 mol of C2H2 with 7.4 mol of O2?
Every measurement has a measurement uncertainty. Discuss how precise and accurate measurement can be achieved in spite of the inherent measurement uncertainty.
The mole fraction of potassium nitrate in an aqueous solution is .0194. The density of the the solution is 1.0627 g/mL. Calculate the molarity of the solution.
A 15 L flask containing a sample of nitromethane is filled with O2 and the flask is heated to 100 celcius. At this temperture, and after the reaction is complete
What is the vapor pressure (in torr) above a solution prepared by mixing 47.89 g of water, H2O, with 47.65 g of ethanol, C2H5OH, at 63.50 °C?
Calculate the mass of calcium carbonate formed when 25 mL of a solution of calcium chloride at 0.10 M react with sodium carbonate in excess
The vapor pressure of water is 439 mm Hg at 358 K, and the enthalpy of vaporization is 40.7 kj/mol.
Calculate [OH] for a solution formed by adding 5.00 mL of 0.140M KOH to 15.0 mL of 9.0×10-2M Ca(OH)2.
how many moles of nitrogen are in 5.3 L container at 1.25 atm and a temp of 85 degrees C.
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