Chem HELP! (1 Viewer)

[zxreth]

Hey guys i need help with the following questions:

1.0L of alcohol burns in 3.0L of oxygen to produce 2.0L of carbon dioxide.

a)write the molecular formula for the alcohol
b)write the balanced equation for the combustion
c)What is the molar mass of the alcohol
d)what assumption are you making in this excercise

Thanks! =]

 

[muzeikchun852]

Hey guys i need help with the following questions:

1.0L of alcohol burns in 3.0L of oxygen to produce 2.0L of carbon dioxide.

a)write the molecular formula for the alcohol
b)write the balanced equation for the combustion
c)What is the molar mass of the alcohol
d)what assumption are you making in this excercise

Thanks! =]

a) C2H5OH
b) C2H5OH + 3 O2 → 2 CO2 + 3 H2O(l)
c) −1371 kJ/mol (copyed from wiki)
d) dont really understand wats the question trying to ask.

 

[iRuler]

c)What is the molar mass of the alcohol

c) C2 = 12.01 x 2 = 24.02, H6 = 1.008 x 6 = 6.048, O = 16.00

Molar Mass = 24.02 + 6.048 + 16 = 46.068

d)what assumption are you making in this excercise

d) Year 11 chem sucks.

 

[thongetsu]

c) −1371 kJ/mol (copyed from wiki)

you're thinking of molar heat of combustion

 

[iRuler]

wait I think d) might be to do with how complete the combustion is, so maybe it's complete combustion?