Chemistry, 08.07.2019 11:00 adrianvigil6400

An unknown compound contains only carbon, hydrogen, and oxygen (cxhyoz). combustion of 4.50 g of this compound produced 6.60 g of carbon dioxide and 2.70 g of water. how many moles of hydrogen, h, were in the original sample

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Answer from: fayth8312

The number of moles of Hydrogen H that were in the original sample is

0.30 moles

calculation find the formula of the unknown compound write the equation for reaction

CxHyOz + O2 → CO2 + H2O

find the moles of CO2 produced

moles= mass/molar mass

= 6.60g/44 g/mol=0.15 moles

find the moles of CxHyOzmoles of CO2= moles of CxHyOz therefore the moles of CxHyOz =0.15 moles
find the molar mass of CxHyOz

molar mass= mass/ moles

= 4.50/0.15= 30 g/mol

determine value the for X,Y,Z

C =x(12 g/mol) if x=1 then c= 12 g/mol

H= y (1 g/mol) if Y=1 then H=1 g/mol

O=Z(16g/mol) if O=16 then O= 16g/mol

the formula of the compound from the value of X,y and z above = CHO

the MW of CHO= (12 g/mol + 1 g/mol +16g/mol)= 29 g/molsince the molar mass of the compound was 30 g/mol 1 more atom of oxygen is required, therefore the formula of unknown compound= CH2Ofrom the moles of CH2O= 0.15 moles and there are two atoms of H in CH2O therefore the moles of H atom = 0.15 x2=0.30 moles

Answer from: Quest

definition

entropy is a measure of the randomness or the extent of disorder of a chemical process.

enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

entropy is measured in joule per kelvin (jk⁻¹) whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

Answer from: Quest

Answerδh > 0explanationc₆h₆ (s) → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.

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An unknown compound contains only carbon, hydrogen, and oxygen (cxhyoz). combustion of 4.50 g of thi...