Astudent added three volumes: 0.351 ml, 0.350 ml and 0.349 ml. the total volume should be reported (type the units too) as:

- 1.050 mL

Solution:- Volume is an additive property. So, we add all the three given volumes to get the total volume.

Total volume =

Since in addition, we go with least decimal places, the answer must have three decimal places as all the given numbers have three decimal places each.

Hence, the total volume should be reported as 1.050 mL.

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.