Two chemistry problems I'm having difficulty with...?

teeheequeen

New member
1. when ammonium nitrate is heated, it decomposes to give nitrogen gas. this property is used to inflate some balls.
a. write a balanced equation for this reaction (i think i got this part - NH4NO2 --> N2 + 2H2O)
b. calculate the grams of ammonium nitrate need to inflate a tennis ball to a volume of 86.2 mL at 1.20 atm and 22.0 degrees C (here, would i use PV = nRT and plug in the given numbers to determine moles and then work my way back to the ammonium nitrate then convert to grams?)

Also, I DID this problem, but I'm concerned about the answer I got:
2. calculate the real and ideal pressure of hydrogen gas at 891 degrees C if you have 2.00 mol of this gas at a volume of 5.00 L. find the percent error.

with number 2, my ideal is 38.2 and my real is 38.3. when i find the difference and divide by real to determine percent error, i get 0.002617..., but with significant figures considered, that's just a 0, isn't it? or would i say 2.61 * 10^ -3 or just round up to 1%
 
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