Balancing Chemical Equations and Calculating Total Pressure in a Reaction

[omni]

in tank with volume 5 L contains 0.176 mol of NO in 298k temperature, then we put in this tank 0.176 O2
so we got a reaction that create NO2.
i need to write the balanced equation for this reaction.
so this what i got but i sure is not correct. NO+O2--->NO2 ? how can i get NO2 from NO+O2? how is it possible?


and then i need to calculate the total pressure in the end of the reaction.
what mean i need to find P=PO2+PNO? if yes can you give me the formula for this ?

thanks.

 

[SteamKing]

Step 1: Write a balanced chemical equation.

 

[omni]

well as you can see i tried to do it but i diden't succeed
how can i write a balanced chemical equation of NO+O2 and get NO2 is not possible i think.

 

[omni]

i think is will be N0+1/2O2--->NO2

 

[QuarkCharmer]

i think is will be N0+1/2O2--->NO2

Now that you have the 1/2 coefficient on the Oxygen diatomic, isn't there something that you can do to the whole equation to turn it into a proper whole number?

 

[omni]

well maybe to do 2NO+O2--->2NO2?

thanks.

 

[QuarkCharmer]

That's right.

I find it helpful when balancing equations to first figure out the coefficients of the larger molecules and leave things like diatomics for last. That way you can do as you did, and put in a fraction that would mathematically balance the equation, and then just multiply through by a whole number to satisfy the equation.

 

[omni]

ok thanks for help.