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Concentration of Ore

An ore is ana...

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An ore is analyzed for manganese content by converting the manganese to Mn3O4 and weighed? -if a 1.52g sample yields Mn3O4 weighing 0.126g (a)what will be percent Mn2O3 in sample? (B)what is the percent of Mn? Gravimetric analysis

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M n O_{2}

on ignition converts into

M n_{3} O_{4}

. A sample of pyrolusite having

75 % M n O_{2}, 20 %

inert impurities and rest water is ignited in air to constant weight. What is the percentage of

M n

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Q. A sample of blue copper (II) sulfate is analyzed using a spectrophotometer (or colorimeter). When analyzed by four different wavelengths, the solution obtain the following absorbance data:

∙ 425 n m = 0.12

∙ 480 n m = 0.25

∙ 510 n m = 0.98

∙ 610 n m = 0.11

What is the optimum wavelength(s) to be used for analysis?

Q. What is the oxidation number of manganese in

{M n O_{4}}^{-}, M n_{2} O_{3}, a n d M n O_{2}

0.60 g

sample consisting of only

C a C_{2} O_{4}

M g C_{2} O_{4}

500^{\circ} C

, converting the two salts of

C a C O_{3}

M g C O_{3}

. The sample then, weighs

0.465 g

. If the sample had been heated to

900^{\circ} C

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C a O

M g O

, what would the mixtures of oxides have weighed?

5.0 g

sample of copper(II) oxide containing an inert contaminant is analyzed and found to contain

3.0 g C u

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64 g / m o l

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16 g / m o l

for oxygen, determine the percent purity of the copper(II) oxide sample.

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