The process of iron combining with oxygen to form rust is considered a chemical change because rust has the same chemical composition as iron © properties that differ from both iron and oxygen O a very high melting point O greater chemical reactivity than oxygen

The process of iron combining with oxygen to form rust is considered a chemical change because rust has the same chemical composition as iron © properties that differ from both iron and oxygen O a very high melting point O greater chemical reactivity than oxygen

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter13: Isolation Of Eugenol From Clov

Section: Chapter Questions

Problem 9Q

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3. 1986 B Three volatile compounds X, Y, and Z each contain element Q. The percent by weight of element Q in each compound was determined. Some of the data obtained are given below. Percent by Weight of Element Q Compound Molecular Weight 64.8% Y 73.0% 104. Z 59.3% 64.0 The vapor density of compound X at 27°C and 750. mm Hg was determined to be 3.53 grams per litre. Calculate the molecular weight of compound X. Determine the mass of element Q contained in 1.00 mole of each of the three compounds. Calculate the most probable value of the atomic weight of element Q. Compound Z contains carbon, hydrogen, and element Q. When 1.00 gram of compound Z is oxidized and all of the carbon and hydrogen are converted to oxides, 1.37 grams of CO, and 0.281 gram of water are produced. Determine the most probable molecular formula of compound Z. а. b. с. d.
1. Which of the following compounds can form hydrogen bonds with water?a. octaneb. HClc. NaCld. acetic acid2. Maria wants to determine the percent water content of an unknown hydrate of AB. Given the following data:mass of empty crucible - 12. 2784gmass of AB · xH20 + crucible - 17.4960gmass of AB + crucible - 15.1314gCalculate the % water content of the hydrate3. From the above data, give the correct formula for the hydrate. (AB₂ Molar mass = 129.84 g/mol)
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Based on the thermogravimetric analysis for copper(II) sulfate pentahydrate shown below, what is the %by mass of water in the compound? 100 95 90 85 80 75 70 65 63.93% 60 % of Mass 0 7.214% O24.836% 63.93% 36.07% 14.428% -2 H₂O -14.428% of mass -2 H₂O -14.428% of mass -1 H₂O -7.214% of mass y 50 100 150 200 250 300 350 400 450 Temperature, C
1. A boiler burns fuel oil with the following analysis by mass : 80% C 18% H2 2%S 30% excess air is supplied to the process. Calculate the stoichiometric ratio by mass and the % Carbon Dioxide present in the dry products. (15.62/1 14.9% CO2) 2. A boiler burns coal with the following analysis by mass : 75% C 15% H2 7%S remainder ash Calculate the % Carbon Dioxide present in the dry products if 20% excess air is supplied. (16.5% CO2) 3. Calculate the % of each dry product when coal is burned stoichiometrically in air. The analysis of the coal is: 80% C 10% H2 5% S and 5% ash. (76.7%N, 22.5% CO2 0.8% SO2)
03.) The compound sodium thiosu Hate pentahyclrate, NazS,0g- H20, s importont commercially to the photography business as" hypo," because it has the ability to dissolve unreated silver salts from photographč film during develepment. Soplum thiosulfat pentahydrate Con be produced" by boiling elemental sulfur . o0 aque ous hunbalarced) solution of sochum sulfite SpIsst NazSOzlagy+H20(1) >Naz Sz@:SH2015)
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Please Answer the 2 (21,22) questions only with correct answers and solutions
3- A sample of a solution weighing 850.0 g is knowno con potassium chlorice, What is the weight percent of potaSINm chloa in the solution? Ans. 1.96% n0203 moles of 4- Conc. HCl has a density of 1.19 g mL and is about weight HCI. The Molarity and norraality of the solution is: (a) 11.9 and 11.9 (c) 12.07 and 12.07 (d) 5.95 and 11.90 (b) 11.9 and 23.8 Show your calculations Ans (a)
(10) 6. A student was given a white solid for an unknown. Its melting point range was 78-81 °C. The student has previously worked with naphthalene and observed that it was a white crystalline solid with a melting point of 80.3 °C. (a) Can the student conclude that the unknown is naphthalene based on this information? Why or why not? (b) What additional experimental work should be done to verify this compound?
cricket A ♡ | 32% 8:47 PM 25. Some people like to make their own hand lotion because it can be less expensive than buying it and they have the ability to add only the fragrances that they like. A recipe for hand lotion calls for mixing 327 g of water (H,O) with 311 g of glycerin (C3H3O3). This recipe makes a total of 550. mL of hand lotion. (a) What is the mass percent of glycerin in the hand lotion? (b) What is the molarity of glycerin in the hand lotion? OÇR OCR Sign Delete