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makaylahamrick
24.03.2021 •
Chemistry
Select all pressures that are equal.
780 torr
101.3 kPa
201.3 kPa
760 mmHg
1 atm
670 mmHg
Solved
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Ответ:
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 producedmoles= 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 molesfind 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