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
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: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter2: Chemical Compounds
Section: Chapter Questions
Problem 77QRT: You have a pure sample of apholate, C12H24N9P3, a highly effective commercial insecticide.
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Q. 140?
![and O. Combustion of 19.81 mg terephthalic acid produces
41.98 mg CO, and 6.45 mg H,O. If 0.250 mole of terephthalic
acid has a mass of 41.5 g, determine the molecular formula for
terephthalic acid.
139. A sample of a hydrocarbon (a compound consisting of only
carbon and hydrogen) contains 2.59 X 1023 atoms of hydrogen
and 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) sulfate
CUSO, xH,O
was 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 waters
of hydration of copper(II) sulfate. It specifies the number of water
molecules per formula unit of CuSO, in the hydrated crystal.]
142. ABS plastic is a tough, hard plastic used in applications
requiring shock resistance. The polymer consists of three
monomer units: acrylonitrile (C;H;N), butadiene (C,H6), and
styrene (C3Hs).
a. A sample of ABS plastic contains 8.80% N by mass. It
took 0.605 g of Br, to react completely with a 1.20-g
sample of ABS plastic. Bromine reacts 1:1 (by moles)
with the butadiene molecules in the polymer and nothing
else. What is the percent by mass of acrylonitrile and
butadiene in this polymer?
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Transcribed Image Text:and O. Combustion of 19.81 mg terephthalic acid produces
41.98 mg CO, and 6.45 mg H,O. If 0.250 mole of terephthalic
acid has a mass of 41.5 g, determine the molecular formula for
terephthalic acid.
139. A sample of a hydrocarbon (a compound consisting of only
carbon and hydrogen) contains 2.59 X 1023 atoms of hydrogen
and 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) sulfate
CUSO, xH,O
was 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 waters
of hydration of copper(II) sulfate. It specifies the number of water
molecules per formula unit of CuSO, in the hydrated crystal.]
142. ABS plastic is a tough, hard plastic used in applications
requiring shock resistance. The polymer consists of three
monomer units: acrylonitrile (C;H;N), butadiene (C,H6), and
styrene (C3Hs).
a. A sample of ABS plastic contains 8.80% N by mass. It
took 0.605 g of Br, to react completely with a 1.20-g
sample of ABS plastic. Bromine reacts 1:1 (by moles)
with the butadiene molecules in the polymer and nothing
else. What is the percent by mass of acrylonitrile and
butadiene in this polymer?
a+p
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