Were you given an equation for the decomposition? If so, make sure it agrees with what I've written; otherwise I will use this one.
2NaN3 ==> 2Na + 3N2
volume of bag is 25 x 25 x 20 = approx approx 13,000 cc or about 13 L but you need a better answer than this estimate. All numbers below this one are estimates also.
Use PV = nRT. You know P, V, R and T (must be in kelvin). Solve for n = mols. That will be mols N2.
Use the coefficients in the balanced equation to convert mols N2 to mols NaN3. You can see that 3 mols N2 need 2 mols NaN3.
Then grams NaN3 = mols NaN3 x molar mass NaN3.
Do the same procedure for the second part of the problem.
Post your work if you get stuck.
Calculate how many grams of sodium azide (NaN3) are needed to inflate a 25.0 × 25.0 × 20.0 cm bag to a pressure of 1.25 atm at a temperature of 20.0°C. How much sodium azide is needed if the air bag must produce the same pressure at 10.0°C?
20.0°C:
_______ g NaN3
1 answer