Thank you so much! I got three more questions though...

 

1. Car air bags operate by the explosive reaction of NaN3:

2NaN3(s) --> 2Na(s) + 3N2(g)

What mass of NaN3 must be used to fill a 70L air bag at 20 celcius and 1 atm pressure?

I keep on getting 189, could you please show me where I got wrong?

 

2. The following reaction takes place at 300K under a constant external pressure of 10^6 Pa. What is the work done if 20ml of NO2(g) is formed during the reaction?

2NO(g) + O2(g) --> 2NO2(g)

I did work = -p(delta)nRT and got 2494200000!!

I'm not sure where to do the unit conversion.

 

Finally, I saw the annoucement that MSN groups will close in Feb 2009, does that mean no more Chemistry Corner?