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Question- Calculate the percent by mass of zinc in the post-1982 pennies using following information: the total mass of each penn is 2.500 g, the density of copper is 8.96 g/mL, the density of zinc is 7.14 g/mL, and the mass of a penny if it were 100% copper would be 3.11g
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at 25.0degc a sample of xe gas occupies 545 ml in a piston-cylider apparatus when the external pressure is 751 torr. at
Calculate the pH of a solution prepared by mixing 10.0 mL of 0.500 M NaOH and 20.0 mL of 1.50 M benzoic acid solution. (Benzoic acid is monoprotic: it's ionization constant is 6.7 x 10-5)
Calculate the concentration of iodide (I-1) in a solution obtained by shaking 0.10M KI with an excess of AgCl(s).
Derive the general expression for the work per kilomole of a van der waals gas in expanding reversibly and at a constant temperature
Describe implications of the proposal that all reactions are chemical equilibrium as well as that formation of the equilibrium is controlled by kinetics
A rigid Vessel containint initially 100kg of water is going to be heated from 25 degree C to 80 degree C using steam as a medium. the steam will be added slowly such that all the steam condenses.
Problem- The typical energy differences for transitions in the microwave, IR, and electronic spectroscopies are 5x10^-22 J , 0.5x10^-19 and 1x10^-18 J. Calculate the ratio of the number of molecules in two adjacent energy levels at 300 K in each c..
Calculate the pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in dimethylamine (aq) and 0.100 M in dimethylamine hydrochloride (aq). Use the pKa given in your textbook (Harris, appendix G).
an automobile gasoline tank holds 49kg of gasoline. when the gasoline burns 172kg of oxygen are consumed and carbon
a) how many moles of sulfur are in 23.2 g of (C3H5)2S, b) how many atoms of hydrogen are in 0.75 mol of (C3H5)2S, c) how many grams of carbon are in 4.20 x 10^23 molecules of (C3H5)2S, d) how many atoms of carbon are in 15.0 g of (C3H5)2S
Write an equation for the hydrogenation of glyceryl trilinolenate, a fat formed from glycerol and three linolenic acid molecules.
How many liters of softened water, containing a sodium concentration of 4.0×10-2% sodium by mass, have to be consumed to exceed the FDA recommendation
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