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A solid sample containing some Fe^2+ ion weighs 1.062 g. It requires 24.12 mL 0.01562 m KNno4 to titrate Fe^2+ in the dissolved sample to a pink end point
5 Fe2+ + MnO4-+ 8H+ = 5 Fe3+ + Mn2+ + 4 H2O
a) moles MnO4- = 0.03644 L x 0.0244 M= 0.000899
b) moles Fe2+ = 5 x 0.000899= 0.00450
c)How many grams of iron are there in the sample?
d) What is the precent of Fe in the sample
Small helium-neon lasers emit 2.94 mJ/s of light at 634 nm. How many photons does such a laser emit in one minute?
Calculate the percentage of He atoms at 100oC which have speeds in the range between 1200 m/s and 1300 m/s. Calculate the percentage of these He atoms that have speeds greater than 5000 m/s
Calculate the molality of the unknown compound (m). m=mol of solute X particles per formation / mass of solvent , kg Data given: Mass of test tube , flask, t-butyl alcohol and unknown
A sample of CuSO4+5H2O and an inert material was dried to constant mass by heating in a crucible. From the data below, what is the calculated percent CuSO4+5H2O in the Sample?
An aqueous solution contains 12.5% NaCl by mass. What mass of water (in grams)is contained in 2.5L of the vapor above this solution at 55 celcius? the vaor pressure of pure water at 55 celcius is 118 torr.
What is the initial mole of Aniline? what is the initial mole oh HNO3 if 40mL of the acid was used in the titration
Given the following percent composition, what is the molecular formula? 40%C, 6.7% H, 53.3% O
When CO2 is bubbled through an ether solution of benzylmagnesium bromide, and the resulting mixture is acidified, phenylacetic acid is produced.
Calculate Delta H for the process. Given u ={(2a/RT) - b}/Cp,m; with Cp,m = 38.4j/K.mol; a=3.60dm6 atm and b= 0.44 dm3.mol.
The Tank contains how many grams of oxygen gas? A steel cylinder with a volume of 12.50 L contains oxygen gas at a pressure
Determine ΔHreaction° for: 4H2O (l) + 2 NH3 (g) → 2NO2 (g) + 7H2 (g) using the following two equations: (1) N2 (g) + 3H2 (g) → 2 NH3 (g) ΔH1° = -184 kJ (2) 4NO2 (g) + 8H2 (g) → 2 N2 (g) + 8 H2O (l) ΔH2° = -196 kJ
Assuming complete dissociation and ideal behavior, what would be the boiling point of an aqueous solution of MgCl2 that is 8.0% MgCl2 by mass? For H2O
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