5) 6.61 grams of octane, a molecule composed of oxygen and hydrogen that isfound in gasoline, is analyzed by combustion. The reaction produces 20.39 grams of CO2and 9.38 grams of H2O.a. What is the empirical formula of octane? Show calculations to supportyour answers.b. The molecular weight of octane is found in another experiment to be114.2 g/mol, what is the molecular formula of octane?

Generally, the hydrocarbon consists of carbon and hydrogen atoms, Let's take the general empirical…

5) 6.61 grams of octane, a molecule composed of oxygen and hydrogen that is found in gasoline, is analyzed by combustion. The reaction produces 20.39 grams of CO2 and 9.38 grams of H20. a. What is the empirical formula of octane? Show calculations to support your answers. b. The molecular weight of octane is found in another experiment to be 114.2 g/mol, what is the molecular formula of octane?

5) 6.61 grams of octane, a molecule composed of oxygen and hydrogen that is found in gasoline, is analyzed by combustion. The reaction produces 20.39 grams of CO2 and 9.38 grams of H20. a. What is the empirical formula of octane? Show calculations to support your answers. b. The molecular weight of octane is found in another experiment to be 114.2 g/mol, what is the molecular formula of octane?

Chemistry In Focus

7th Edition

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Tro, Nivaldo J.

Chapter4: Molecules, Compounds, And Chemical Reactions

Section: Chapter Questions

Problem 6SC

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Potassium superoxide, KO2, is employed in a self-contained breathing apparatus used by emergency personnel as a source of oxygen. The reaction is 4KO2(s)+2H2O(l)4KOH(s)+3O2(g) If a self-contained breathing apparatus is charged with 750 g KO2 and then is used to produce 188 g of oxygen, was all of the KO2 consumed in this reaction? If the KO2 wasnt all consumed, how much is left over and what mass of additional O2 could be produced?
High-density lipoprotein (HDL) cholesterol is the good cholesterol because adequate levels reduce the risk of heart disease and stroke. HDL levels between 40. and 59 mg/dL are typical for a healthy individual. What is this range of HDL cholesterol in units of mol/L? The formula for cholesterol is C27H46O.
Consider Cl2+F2=CLF3 (ΔH°f = -164.65 kJ/mol) . If 42 g of F2 is combined with 142 g of Cl2, how much grams of ClF3 can be produced? How much of the reagent is left over? What is the enthalpy change?
a) Calculate the molar mass of sucrose, C12H22O11.(b) How many moles of sucrose are present in: (i)1.00 gram; (ii) 1.00 pound, and (iii) 1.00 kg of sucrose?(c) How many sucrose molecules are present in a 4.536-gsampleof sucrose?(d) How many atoms of carbon, hydrogen, and oxygen,respectively, are present in 4.536 g of sucrose?(1 lb = 453.6 g; Avogadro’s number = 6.022 x 1023/mol)
Caproic acid, which is responsible for the foul odor of dirty socks, is composed of C, H and O atoms. Combusting a 0.450 g sample of the compound in air produces 1.024 g CO2 and 0.418 g H2O. MW of caproic acid = 116 g/mol. What is the molecular formula of caproic acid?
Pentaerythritol tetranitrate (abbreviated PETN, chemical formula C5H8N4O12) is an explosive material with a structure that is very similar to nitroglycerin. It is one of the components of plastic explosives such as Semtex. The explosion of PETN can be represented by: C5H8N4O12(s)→2CO(g)+4H2O(g)+3CO2(g)+2N2(g) A plastic explosive charge is formed into a cylinder about 30 cm long and about 2 cm in diameter. It weighs about 276 grams and is 58.5% PETN by mass. What is the total number of moles of gas produced when this plastic explosive charge explodes?
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The compound dioxane, which is used as a solvent in variousindustrial processes, is composed of C, H, and O atoms.Combustion of a 2.203-g sample of this compound produces4.401 g CO2 and 1.802 g H2O. A separate experiment showsthat it has a molar mass of 88.1 g>mol. Which of the followingis the correct molecular formula for dioxane?(a) C2H4O (b) C4H4O2 (c) CH2 (d) C4H8O2
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