Mary Maloney is single; she is 36 years old and adopted two children 5 years ago Ben 8 and Rebecca 20. She works for a multi-national corporation headquartered in the United States which she spends a lot of time out of the country in Dubai, where she earned $29,000 and $40,200 in the United States. She had to pay $4,630 to Dubai in taxes and has a potential U.S. tax liability of $9,569. She had withholdings of $9,654. Because she needs help with Ben when she is not in the country she pays $2,700 in babysitters adn $10,500 for 3rd grade private school. She has invested well and recieves $5,400 in dividends from domestic corporations and $7,400 in interest in municipal bonds. Rebecca is attending Pace University were she dorms and is studying accounting. Mary is very happy that she could send Rebecca to Pace and if it wasn’t for the American Opportunity Credit she would not be able too. Because of this the phase outs concern her for this credit based on her income.x

A) What is Mary’s taxable income and tax liability?

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1) You are given an unknown containing KClO3.

Following the procedure in your manual, you obtain the following fictional data

Note! For this problem use the given (allbeit incorrect) vapor pressure of water

Mass of empty test tube74.2659 gMass of test tube + unknown74.5581 gMass of test tube + unknown + MnO274.6447 gMass of erlenmeyer flask with residual water337.57 gMass of erlenmeyer flask filled with water358.42 gAtmospheric pressure763.9 mmHgTemperature of water30.4 °CPartial pressure of water at 30.431.66 mmHgMass of test tube + Residue after heating74.5939 gDensity of water.996 g/mLCalculate

  (c) Volume of oxygen corrected to STP_______________ mL  (d) Mass of oxygen produced_______________ g  (e) Moles of oxygen gas produced_______________ mol  (f) Calculated molar volume at STP_______________ L/molB) Per cent KClO3 in unknown  (g) Mass of unknown used_______________ g  (h) Moles of KClO3 calculated from moles O2

_______________ mol  (i) Mass of KClO3 in unknown calculated from moles O2

_______________ g  (j) Per cent KClO3 in unknown_______________ %C) Residual “KCl??” from UNKNOWN 

     Residual “KCl??” is what is left in the tube after heating except for the MnO2

  (k) Mass of residual KCl? produced from UNKNOWN_______________ g  (l) Theoretical yield of KCl if UNKNOWN is 100% KClO3_______________ g  (m) % Yield of “KCl” based on k and l above_______________ %handbook

the actual vapor pressure of water at 30.4 °C_______________ mmHgWARNING…Do not use this number in problem 1

Mass of empty test tubeMass of test tube + unknownMass of test tube + unknown + Mn02 Mass of erlenmeyer flask with residual waterMass of erlenmeyer flask filled with water Atmospheric pressure Temperature of water Partial pressure of water at 30.4 NIass of test tube + Residue after heatingDensity of water 74.2659 g74.5581 g74.6447 g337.57 g353.42 g 763.9 mmHg30.4 °C 31.66 man74.5939 g.996 gme Use the following units: it mol torr "’5 "1L (manual-17.) L(iflLorgreater) item value unitsVolume oi oxygen collected (a) 20.93 mLPartial pressure of dry oxygen (b) T3224 mmHgVolume oi oxygen at STP (c) 19.114 mLMass of Oxygen gas produced (d) 0.0508 gMoles of Oxygen gas produced (e) 0015884 molCalculated molar volume of oxygen [1) 22.4 UmolMass of unknown used (g) 0.2922 gMoles of KC103 present (11) .0011 molMass of KClO3 present (i) .242 9Per cent KC103 in unknown (D 44.35 %Mass of residual KC]? remaining (k) .2414Theoretical mass of KC] based on unknown .17? gused (1)Per cent recover of KCl (m) 136 % Submit

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Trial 2:

Questions and Conclusions:

1. Describe the process that was used in this lab to create magnesium oxide, specifically identifying the type of chemical reaction. Explain why the product had a higher mass than the reactant, and how this relates to conservation of matter.
2. What sources of error may have contributed to the percent yield not being 100 percent? Think about things that may have led to inaccurate measurements or where mass of the product could have been lost if this experiment was conducted in a physical laboratory.

1. When conducting this experiment, some procedures call for heating the substance several times and recording the mass after each heating, continuing until the mass values are constant. Explain the purpose of this process and how it might reduce errors.
2. Your company currently uses a process with a similar cost of materials that has an average percent yield of 91 percent. If the average percent yield of this process is higher than that, this could save the company money. What is your recommendation to the company? Please support your recommendation using your data, calculations, and understanding of stoichiometry gathered from this lab.

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Mass-energy equivalence states that mass is oonoentrated energy. In his dteory of special reiatiyity Einstein formulated the equation E=rncfl2. There is a tremendous amount ol energy in mass. A Eng marble contains as muchenergy as a soc kiloton hydrogen bomb. but this energy is yery difficult to release. It can be released through matter—antimatter annihilation. when matter and antimatter dome together. Nuclear reactions can be understoodto release so much more energy than chemical reactions because ofthe mass changes. 2} How much mass-energy is there in 1 gram ol matter [about as much mass as a paper clipi? Assuming youcould conyert this entire mass into energy. for how many years oould you mn a 1430 w light bulb orl‘l the energy oontained within this gram of matter?

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