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Calculate the current (mA) required to deposit 0.89g of tungsten metal in 45 minutes from a solution of WO42-. (Atomic weight: W=183.8)
Predict the aqueous phase equilibrium concentration of phenanthrene at 25*C if the values for this compound are Cs = 1.1 mg/L, P^v = 1.6 x 10^-7 atm, KH = 4.0 x 10^-5 atm*m^3/mol, and logKow = 4.52.
Potassium and oxygen gas react to form potassium oxide. b. Sodium and water react to form sodium hydroxide and hydrogen gas. c. Iron and oxygen gas react to form iron (III) oxide.
What is the barium ion concentration in a saturated barium fluoride solution made by adding solid BaF2 until no more dissolved
determine the number of representative particles in each substancea. 250 mol of silverb. 8.56 x 10-3 mol of sodium
A reaction in water causes the water in beaker to cool from 25 degrees Celsius to 21 degrees Celsius. The volume of water 150ml (d=1.0g/ml). What is the heat absorbed by the reaction?
How many moles of gas are there in a gas-filled balloon, which has a volume of 67.0 L at a pressure of 742 mmHg and a temperature of 25.0°C?
a 10.00g sample of toothpaste contaning stannous fluoride gives0.145g precipitate of stannous phosphate.what is the percentage of snf2 in the toothpast sample.
Nitrogen dioxide and water react to produce nitric acid HNO3, and nitrogen oxide: 3NO2(g) + H2O(l) -------- 2HNO3(aq) + NO(g)
Calculate Delta Ssurr and Delta Stotal at 70 degree. B) Does benzene boil at 70 degree and 1 atm pressure? Calculate the normal boiling point of benzene.
The rate of SN2 of tert-butyl bromide is faster in polar aprotic solvents than in polar protic solvents. Why? a. polar aprotic lower the potential energy of the product.
Explain how this model can be used to reduce the number of dangling bonds from 49 (unreconstructed) to 19 (constructed). B. Explain the origin of the name dimer adatom stacking fault.
A titration is performed in which 50.0 mL of 0.0463 M acetic acid (Ka = 1.8 x10^- 5) is titrated with 0.1000 M NaOH. Calculate the pH at the beginning of the titration (Vb = 0).
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