## Equation balance help

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metalgearrex21
Newbie
Posts: 2
Joined: Fri Oct 16, 2020 4:18 am

### Equation balance help

Hi,

Could someone help me balancing this equation? I am second guessing myself that I have written the equation from the question correctly in the first place.

"Bacterial cells with an empirically determined molecular formula of C5H7NO2 are grown on a
glucose substrate with ammonia as nitrogen source. The yield of cells is determined to be
0.42 g cells/g glucose.
a. Write and balance a stoichiometric equation to describe this system
b. What is the respiratory quotient?"

The equation I think it is from the question:

C6H12O6 + NH3 = C5H7NO2 + CO2 + H20

(Glucose + Ammonia) = (Cells + Carbon dioxide + Water)

Then after I balanced it:

5C6H1206 + 6NH3 = 6C5H7NO2 + CO2 + 18H20

If anyone could help in anyway I'd be really grateful, struggling with the content in this course at the moment so any help would be appreciated.
ChenBeier
Distinguished Member
Posts: 678
Joined: Wed Sep 27, 2017 7:25 am
Location: Berlin, Germany

### Re: Equation balance help

The balanced equation is still wrong.
Left 30 C, 78 H, 30 O, 6 N Right 31 C 78 H, O 32 ,6 N
You forget to count the CO2

The RQ = V(CO2)/V(O2)
metalgearrex21
Newbie
Posts: 2
Joined: Fri Oct 16, 2020 4:18 am

### Re: Equation balance help

Oh yeah I forgot the CO2! From the question I don't think I have the equation correct to begin with though as the respiratory quotient is moles CO2 produced/moles O2 consumed.

I think I should have oxygen on the left maybe also then. And I think I might have to use this formula:

Substrate + Oxygen + Nitrogen Source →(dry) Biomass + Carbon Dioxide + Water

CwHxOyNz + aO2 + bHgOhNi = cCHaObNd + dCO2 + eH2O

I think this is why balancing it the other way isn't working out IO think but I am still confused by it
ChenBeier
Distinguished Member
Posts: 678
Joined: Wed Sep 27, 2017 7:25 am
Location: Berlin, Germany