Polyethylene is a hydrocarbon polymer used to produce food-storage bags and many other flexible plastic items. A combustion analysis of a 1.26-g sample of polyethylene yields 3.94 g of CO₂ and 1.61 g of H₂O. What is the empirical formula of polyethylene? Write numbers only to 3 significant figures (no units) and for numbers < 1 include a "0" before the decimal point. Mass of polyethylene (g) Mass of CO₂ (g) Mol of CO₂ Mol of C Mass of H₂O (g) Mol H₂O Mol of H Mol ratio H:C (mol H/mol C) Empirical Formula of polyethylene ▬▬▬

Polyethylene is a hydrocarbon polymer used to produce food-storage bags and many other flexible plastic items. A combustion analysis of a 1.26-g sample of polyethylene yields 3.94 g of CO₂ and 1.61 g of H₂O. What is the empirical formula of polyethylene? Write numbers only to 3 significant figures (no units) and for numbers < 1 include a "0" before the decimal point. Mass of polyethylene (g) Mass of CO₂ (g) Mol of CO₂ Mol of C Mass of H₂O (g) Mol H₂O Mol of H Mol ratio H:C (mol H/mol C) Empirical Formula of polyethylene ▬▬▬

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Polyethylene is a hydrocarbon polymer used to produce food -storage bags and many other flexible plastic items. A combustion analysis of a 1.26-g sample of polyethylene yields 3.94 g of C*O_{2} and 1.61 g of H_{2} * O What is the empirical formula of polyethylene ? Write numbers only to 3 significant figures (no units) and for numbers < 1 include a "" before the decimal point .
Crime scene investigators keep a wide variety of compounds on hand to help with identifying unknown substances they find in the course of their duties. One such investigator, while reorganizing their shelves, has mixed up several small vials and is unsure about the identity of a certain powder. Elemental analysis of the compound reveals that it is 67.31 % carbon, 6.978% hydrogen, 4.617% nitrogen, and 21.10% oxygen by mass. Which of the compounds could the powder be? C17H19NO3C17H19NO3 = morphine, analgesic C17H21NO4C17H21NO4 = cocaine, illicit drug C7H5N3O6C7H5N3O6 = 2,4,6-trinitrotoluene (TNT), commonly used explosive C10H15NC10H15N = methamphetamine, stimulant C4H5N2OC4H5N2O = caffeine, stimulant C11H15NO2C11H15NO2 = 3,4-methylenedioxymethamphetamine (MDMA), illicit drug C21H23NO5C21H23NO5 = heroin, illicit drug C3H6NO3C3H6NO3 = hexamethylene triperoxide diamine (HMTD), commonly used explosive
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A 0.732 g mixture of methane, CH4, and ethane, C2H6, is burned, yielding 2.046 g of CO2. What is the percentage by mass of CH4 in the mixture? Enter your answer with 2 significant digits.
Part A: How many atoms of hydrogen does it contain? Express your answer using four significant figures. Part B: How many molecules of glucose does it contain? Express your answer using four significant figures. Part C: How many moles of glucose does it contain? Express your answer using four significant figures. Part D: What is the mass of this sample in grams? Express your answer using four significant figures.
An amount (in grams) of nitrogen gas is reacted with excess hydrogen, according to the balanced reaction shown below. If 104 g of NH3 is recovered, giving a percent yield of 42%, what was the mass of the nitrogen (in grams) that reacted? N2 (g) + 3 H2 (g) --> 2 NH3 (g) Report your answer as an integer, that is as a number with zero decimal places, and with no units. Do NOT use scientific notation.
Liquid hexane (CH,(CH,) CH,) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO,) and gaseous water (H,0). If 42.3 g of carbon dioxide is produced from the reaction of 65.49 g of hexane and 143.2 g of oxygen gas, calculate the percent yield of carbon dioxide. Be sure your answer has the correct number of significant digits in it.
A molecular compound has the formula C12H12O2. How many grams of this compound would you need to measure out in order to obtain 0.0800 mol of the compound? Be sure to calculate your answer to the correct number of significant figures and with the correct units.
I am having a bit of trouble with significant figures and rounding. In a question such as the one below, would the sig fig I put in my answer be correct? How many moles are present in 3.44 g CoCl2 ꞏ 6H2O? = (Which sig fig amount is correct-->) .0217 moles or .021 moles The whole answer was 0.02177904, would I round this answer to the 3rd sig fig? So, is the correct answer actually .022?
A chemist needs 32.0 g of phenol, C6H5OH, for an experiment. How many moles of phenol is this? Explain how to find the molar mass of the compound. Explain how many significant figures your answer needs to have. The numerical answer
The mole is a counting number that allows scientists to describe how individual molecules and atomsreact. If one mole of atoms or molecules is equal to 6.022 × 1023 atoms or molecules, how many moleculesare in a 23.45 g sample of copper (II) hydroxide, Cu(OH)2? (MM of Cu(OH)2 is 97.562 g/mol) Expressyour answer to the correct number of significant figures and you must show all work in the form ofdimensional analysis as shown in Lesson 4. You must solve the problems as they are taught in the course. 4.2 Counting particles of matter. Grams to moles of Copper Hydroxide to molecules of Copper Hydroxide.
A high-performance heater that burns propane, C3H8(g), is adjusted so that 100.0 g of O2(g) enters the system for every 100.0 g of propane. Calculate the mol ratio of oxygen to propane. Write the answer as a decimal containing number. O2 : C3H8 Is this mixture rich or lean?