A few chemistry questions basically proportion calculations

[lionely]

Homework Statement

Chloroethane, reacts with Oxygen according to the equation below:
2C₂H₃Cl + 5O₂ → 4CO₂ + 2H₂O
+2HCl
How many moles of CO₂ are produced when 3.0 moles of choloroethane and 3 mol of O₂ are reacted?When 50cm3 of 1mol/dm3 HCl is mixed with 50cm3 of 1mol/dm3 NaOH, the temp of the resulting solution increases by 6 °C. What will be the temp change when 100cm3 of each of these solutions are mixed?


I'm sorry I don't really have any idea on how to attempt these properly, could you guys give me a hint? Please! The help would be greatly appreciated !

 

[Borek]

Do you know how to read reaction equations? After that it is just a matter of converting amount to moles.

 

[lionely]

So for the first one it is 5mole of Oxygen gives 4 mole of CO2? so
3mole of Oxygen gives X moles?

 

[Borek]

So for the first one it is 5mole of Oxygen gives 4 mole of CO2? so
3mole of Oxygen gives X moles?

Yes, but you have to check if there is enough chloroethane to react with 3 moles of oxygen. Could be there is not enough, then you will have to calculate amount of CO₂ knowing that 2 moles of chloroethane produce 4 moles of carbon dioxide.

This is so called limiting reagent problem.

 

[lionely]

So is it 2 moles of chloroethane react with to produce 4 mole of carbon dioxide
so 3moles gives x?

 

[Borek]

Yes.

 

[lionely]

So the overall answer is 6moles of CO2?

 

[Borek]

How many moles of CO₂ would be produced from 3 moles of O₂?

 

[lionely]

2.4moles