11/08/21

Iron is obtained by reaction of hematite (Fe2O3) with carbon monoxide. From the balanced reaction below, how many grams of iron is produced when 24.6 mol of hematite is used up in the reaction?
Fe2O3 + 3CO --> 2Fe + 3CO2
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11/08/21

when 100 grams of N2 is produced then how many moles of (NH4)2Cr2O7 will be required?
(NH4)2Cr2O7 --> N2 + Cr2O3 + 4H2O
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11/04/21

Describe the main meteorological and chemical processes leading to the start and end of stratospheric ozone hole in Antarctica
Describe the main meteorological and chemical processes leading to the start and end of stratospheric ozone hole in Antarctica
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11/04/21

Show an absorption spectrum of iron and explain.
In class, we were talking about the red waterfalls in Antarctica and how and why the iron content and air made it red. But we also need to show an example of an absorption spectrum of iron and... more
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11/04/21

Percent Recovery from an Experiment
The solubility of benzoic acid in water is 0.07 g/100 ml at 0oC and 6.8 g/100 ml at 100oC. Answer the following questions if 5.1 grams of benzoic acid were to be heated to boiling in 100 ml of... more
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11/03/21

Suppose a boil water notice is sent out advising all residents in the area to boil their water before drinking it or using it for cooking.

You need to boil 19.5 L of water using your natural gas (primarily methane) stove. What volume of natural gas is needed to boil the water if only 19.6% of the heat generated goes towards heating... more
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11/03/21

Chemistry moles and molars problem

Write two different stoichiometric coefficients that you could use when doing conversions involving the following chemical equation: 4 Na + O2 → 2 Na2O (+ 2 points if you can create three)
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11/03/21

quant chemistry
When 5.00 mL of 0.1032 M NaOH was added to 0.1123 g of alanine in 100 mL of 0.100M potassium nitrate solution, the measured pH was 9.57. Using activity coefficients, determine pKa2 for alanine?
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11/03/21

quant chemistry
Sketch to titration curve of 25.00 mL of 0.05 M citric acid with 0.100 M sodium hydroxide. Label appropriate points along the curve
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11/03/21

quant analysis chemistry

Calamine, which is used for relief of skin irritations, is a mixture of zinc and iron oxides. A 1.022g sample of dried calamine was dissolved in acid and diluted to 250 mL. Potassium fluoride was... more
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11/03/21

quantitative analysis chemistry
Calculate the concentration of Mn2+ at the following points in the titration of 25.0 mL of 0.0200M MnSO4 solution with a solution of 0.0100 M EDTA in a solution buffered at pH 8. Sketch the... more
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11/03/21

quantitative analysis
Consider the polyprotic acid pyridoxal-5-phosphate. What are the fractions of each form present at a pH of 7.6.
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11/03/21

How much energy is required to melt 25g of ammonia at the melting point? Heat of vaporization is 327 cal/g and Heat of fusion is 84 cal/g.
How much energy is required to melt 25g of ammonia at the melting point?Heat of vaporization is 327 cal/g and Heat of fusion is 84 cal/g.
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11/03/21

Calculate the standard enthalpy change for the reaction at 25 ∘ C. Standard enthalpy of formation values can be found in this list of thermodynamic properties. H2O(g)+C(graphite)(s)⟶H2(g)+CO(g)

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11/02/21

3. If the milk’s heat capacity is higher than the coffee’s heat capacity, will you need more milk to drop the coffee’s temperature?

We are task to do this and I am having a hard time to answer this one. I hope someone can help me. During the summer after your first year, you are lucky enough to get a job making coffee at... more
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10/30/21

What temperature (in Celsius) did an ideal gas shift to if it was initially at -22.5 Celsius at 4.62 atm and 35.0 L and the pressure was changed to 2.50 atm and the volume changed to 50.0 L?
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10/29/21

Please explain thank you
Provide an example of both a cation and an anion exchange resins?
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10/24/21

Chemistry Electron configurations

Construct a possible explanation for why true configurations would be a lower potential energy state for the elements in Model 4. HINT: What types of atomic interactions cause a lower potential... more
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10/22/21

A student in prepared a sample solution of 1.89x10^(-4) M oFe+3 from 3.015g of cereal. If the serving size listed is 60 g, what is the student's experimental mass of Fe (mg) in a serving size?
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10/19/21

A copper refining operation uses 34.4 mol of oxygen every second in the refining of copper (I) sulfide. Determine the number of moles of copper(I) oxide produced by this reaction every second.
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10/19/21

A copper refining operation uses 34.4 mol of oxygen every second in the refining of copper (I) sulfide. Determine the number of moles of copper(I) sulfide required for this reaction every second.
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10/19/21

1000 kg of ore typically contains about 18 kg of copper and 58 g of silver Determine the concentration of the silver in the ore in parts per million.
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10/19/21

Chemistry Volume and Concentration question
a) 100cm3 of a standard solution of Na2CO3 was produced by dissolving 0.537g of Na2CO3 in water in a volumetric flask. Calculate the concentration, in mol dm-3, of the Na2CO3 solution.b) On... more
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10/19/21

Intro to chemistry
Consider the reaction:P2O5(s) + 3 H2O(l) → 2 H3PO4(aq)If 12.32 g P2O5 is mixed with 16.76 g H2O, calculate the theoretical yield (g) of H3PO4 produced by the reaction. Need this answer and how you... more
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10/13/21

How long will the cation take?
The electroosmotic velocity of a solution in a particular capillary is 0.736 mm/s. A 21.9 kV potential is applied across the 57.6 cm long capillary. How long will it take a cation with an... more
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