Q. 140? and O. Combustion of 19.81 mg terephthalic acid produces41.98 mg CO, and 6.45 mg H,O. If 0.250 mole of terephthalicacid has a mass of 41.5 g, determine the molecular formula forterephthalic acid.139. A sample of a hydrocarbon (a compound consisting of onlycarbon and hydrogen) contains 2.59 X 1023 atoms of hydrogenand is 17.3% hydrogen by mass. If the molar mass of the hy-drocarbon is between 55 and 65 g/mol, what amount (moles)of compound is present, and what is the mass of the sample?140 A binary compound between an unknown element E and hy-drogen contains 91.27% E and 8.73% H by mass. If the for-mula of the compound is E,Hg, calculate the atomic mass of E.(14). A0.755-g sample of hydrated copper(II) sulfateCUSO, xH,Owas heated carefully until it had changed completely to anhy-drous copper(II) sulfate (CUSO4) with a mass of 0.483 g. Deter-mine the value of x, [This number is called the number of watersof hydration of copper(II) sulfate. It specifies the number of watermolecules per formula unit of CuSO, in the hydrated crystal.]142. ABS plastic is a tough, hard plastic used in applicationsrequiring shock resistance. The polymer consists of threemonomer units: acrylonitrile (C;H;N), butadiene (C,H6), andstyrene (C3Hs).a. A sample of ABS plastic contains 8.80% N by mass. Ittook 0.605 g of Br, to react completely with a 1.20-gsample of ABS plastic. Bromine reacts 1:1 (by moles)with the butadiene molecules in the polymer and nothingelse. What is the percent by mass of acrylonitrile andbutadiene in this polymer?a+p

using the molecular formula is E3H8 Given moles of E presents in compound is 3

Answered: A binary compound between an unknown…

A binary compound between an unknown element E and hy- drogen contains 91.27% E and 8.73% H by mass. If the for- mula of the compound is E,Hs, calculate the atomic mass of E

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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