Chapter 10 - An Introduction to Chemistry: Chemical Calculations ...

Chapter Problems 397
24. The bond between nitrogen atoms in N 2 molecules is very strong, making N 2
very unreactive. Because of this, magnesium is one of the few metals that react
with nitrogen gas directly. This reaction yields solid magnesium nitride.
a. Write a complete balanced equation, without including states, for the
reaction between magnesium and nitrogen to form magnesium nitride.
b. Write a conversion factor that could be used to convert between moles of
magnesium and moles of magnesium nitride.
c. How many moles of magnesium nitride form when 1.0 mole of magnesium
reacts completely?
d. Write a conversion factor that could be used to convert between moles of
nitrogen and moles of magnesium nitride.
e. How many moles of nitrogen react to yield 3.452 moles of magnesium
nitride?
25. Fluorine gas is an important chemical because it is used to add fluorine atoms to
many different compounds. As mentioned in Problem 22, it is difficult to make,
but the following two-step process produces fairly high yields of F 2 .
Objective 2
Objective 3
Objective 2
Objective 3
2KMnO 4 + 2KF + 10HF + 3H 2 O 2 → 2K 2 MnF 6 + 8H 2 O + 3O 2
2K 2 MnF 6 + 4SbF 5 → 4KSbF 6 + 2MnF 3 + F 2
For the second of these two reactions:
a. Write a conversion factor that could be used to convert between moles of
antimony pentafluoride, SbF 5 , and moles of fluorine, F 2 .
b. How many moles of F 2 form when 8 moles of SbF 5 react completely?
c. What is the maximum number of moles of F 2 that could form in the
combination of 2.00 moles of K 2 MnF 6 and 5.00 moles of SbF 5 ?
d. What is the maximum number of moles of F 2 that could form in the
combination of 2 moles of K 2 MnF 6 and 5000 moles of SbF 5 ?
e. Write a conversion factor that could be used to convert between moles of
manganese(III) fluoride, MnF 3 , and moles of F 2 .
f. How many moles of F 2 form along with 0.802 mole of MnF 3 ?
26. For many years, it was thought that no reaction could produce sodium
perbromate, but the discovery of a reaction producing the equally elusive xenon
difluoride, XeF 2 , led to the discovery of the following reaction that yields
sodium perbromate.
NaBrO 3 + XeF 2 + H 2 O
→ NaBrO 4 + 2HF + Xe
a. Write a conversion factor that could be used to convert between moles of
xenon difluoride, XeF 2 , and moles of hydrogen fluoride, HF.
b. How many moles of XeF 2 are necessary to form 16 moles of hydrogen
fluoride?
c. What is the maximum number of moles of NaBrO 4 that could form in the
combination of 2 moles of NaBrO 3 and 3 moles of XeF 2 ?
d. What is the maximum number of moles of NaBrO 4 that could form in the
combination of 2 moles of NaBrO 3 and 3 million moles of XeF 2 ?
e. Write a conversion factor that could be used to convert between moles of
sodium perbromate, NaBrO 4 , and moles of hydrogen fluoride, HF.
f. How many moles of HF form along with 5.822 moles of sodium
perbromate, NaBrO 4 ?
Objective 2
Objective 3