Aburette was improperly read to 1 decimal place giving a reading of 21.7 ml. if the actual volume is 21.86 ml, what is the percent error caused by this mistake?

Answer : The percent error caused by this mistake is, 0.73%

Solution : Given,

Actual volume = 21.86 ml

Measured volume = 21.7 ml

Formula used for percent error :

Now put all the values in this formula, we get the percent error.

Therefore, the percent error caused by this mistake is, 0.73%

n2(g) + 3h2-> 2nh3(g)   this is the balanced equation

note the mole ratio between n2, h2 and nh3.   it is 1 : 3 : 2   this will be important.

moles n2 present = 28.0 g n2 x 1 mole n2/28 g = 1 mole n2 present

moles h2 present = 25.0 g h2 x 1 mole h2/2 g = 12.5 moles h2 present

based on mole ratio, n2 is limiting in this situation because there is more than enough h2 but not enough n2.

moles nh3 that can be produced = 1 mole n2 x 2 moles nh3/mole n2 = 2 moles nh3 can be produced

grams of nh3 that can be produced = 2 moles nh3 x 17 g/mole = 34 grams of nh3 can be produced

note:   the key to this problem is recognizing that n2 is limiting, and therefore limits how much nh3 can be produced.