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question is about a toxic chloroalkane. x. that has a boiling point of 40°c
a student carried out an experiment to determine the mof x by injecting a sample of x
mom a hypodermic syringe into a gas syringe in an oven at 97 "c and 100 kpa the
student's results are set out in table 1 and table 2
table 1
10.340
mass of hypodermie syringe filled with x before
injection /
mass of hypodermic syringe with left over x after
injection /
mass of xinjected /
10.070
table 2
0.0
volume reading on gas syringe before injection of x/
cm
volume of x in gas syringe after injection of x/cm
volume of x/cm
105.0
(a) complete table 1 and table 2 by calculating the mass and volume of x.

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.

points

explanation: