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Calculate the composition, in weight percent, of an alloy that contains 90 kg of Fe, 20 kg of Cr, and 15 kg of Ni. What is the composition of this alloy in atomic percent? Please show your work.
Calculate the delta ph/delta degrees celcius for the ph 8.0 tris solution. how accurate was the use of the ph strip in determining the ph
Consider a glass of 215 mL of water at 28°C. Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved.
Which of the following materials will react with an acid to produce a gas. A) NaOH(aq) B) Na2CO3(aq) C) both (a) and (b) D) neither (a) nor (b) Which of the following materials will react with an acid to produce a gas
Calculate the frequency (Hz) of the photon absorbed when the electron goes from a n= 3.00 energy level to a n= 4 energy level. Express answer in scientific notation.
The energy of the electron in the lowest level of the hydrogen atom (n=1) is -2.179×10-18 J. What is the energy of the electron in level n=6
The combustion of pentane with oxygen is a well known process. Write a balanced equation for the reaction of pentane, C5H12, with oxygen, O2, forming the products carbon dioxide, CO2, and water, H2O. What mass of carbon dioxide will be produced by..
At 25o C, the solubility of magnesium hydroxide Mg(OH)2 in water is 0.00429 grams per Liter. Calculate the Ksp for the compound. [NOTE that there are two moles of OH- per mole Mg(OH)2.]
In preparation of p-iodonitrobenzene, the reaction is driven forward by the formation of N2 gas for two reasons. Reason number one is thermodynamic and reason number two is kinetic. Explain both of these reasons
Calculate the hydronium concentration for a solution prepared by dissolving 0.15 mol of benzoic acid (C6H5COOH) and 0.30 mol of sodium benzoate (C6H5COONa) in 1.00 L of solution. (Ka of C6H5COOH = 6.5 x 10-5)
What is the molar mass of toluene if 0.85 g of toleune depresses the freezing point of 100 g of benzene by 0.47 degrees C. Kf of benzene is 5.12 degrees C/m.
If you have 4.63 g of caffeine dissolved in 69.9 mL of water and the extraction coefficient between H2O and CH2Cl2 is 21.51. How many grams of caffeine will extract into the CH22Cl2 layer if you use 62.9 mL
boron has two naturally occurring isotopes 10b 19.9and 11b 80.1. although the b2 moleculedoes not exist naturally on
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