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A 10.9-g mixture of nitrogen and carbon dioxide is found to occupy a volume of 8.88 L when measured at 641.9 mmHg and 28.5oC. What is the mole fraction of nitrogen in this mixture?
If 24g Mg is used and the percentage yield is 95%, how many grams of magnesium hydroxide should be recovered?
if it takes 1.0 g of solid NaOH to change the pH of the solution containing a strong acid from 1.00 to 2.00, how much solid NaOH would be needed to change the Ph of this solution from 2.00 to 3.00? Assume that there is no change in the volume of t..
What mass (in grams) of NH4Cl is needed to prepare 450mL of 0.251 M NH4Cl solution?
Calculate the freezing point of a solution that contains 8.0 g of sucrose (C12H22O11) in 100. g of H2O. Kf for H2O = 1.86
Calculate the Standard Enthalpies & Standard Entropies for each reactant & product at the temperature given first, then determine the ?H°rxn and ?S°rxn at 1600 K Zr(beta) + O2 = ZrO2(beta) Other information:
You may assume that delta H and delta S are independent of temperature.
What precautions must one take in using internal standard method for analysis of samples in complex matrices
Calculate the number of moles of ions present in 15.1 g of a solution that is 6.30% MgSO4 by mass. What formula do you use for this problem?
What is the barium ion concentration in a saturated barium fluoride solution made by adding solid BaF2 until no more dissolved
Write the equilibrium constant expression, Kc , for the following chemical reaction.
calculate the equilibrium constant (Keq) at 298 K for the reaction below. Use F = 96,500 C/mol for Faraday's constant and R = 8.314 J/(mol K) for the gas constant. 1 Mn2+(aq) + 2 Na(s) 1 Mn(s) + 2 Na+(aq)
The molecular weight of NADH is 663.43g ans it's absorbance coefficient is 6220 M^-1 cm^-1. How much of your solution do you have to dilute to obtain the desired concentration not exceeding volume of 1mL?
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