1 . What are the molecular weights of lithium hydroxide and hydrogen fluoride?

2. In the neutralization of lithium hydroxide solution by hydrofluoric acid solution, how many moles of HF are required for each mole of LiOH?

3. How many moles of HF will be required to neutralize 100 g of LiOH? How many grams of HF will this correspond to?

4. If the neutralized solution of the preceding problem is evaporated to dryness, how many moles of crystalline lithium fluoride will result? How many grams of LiF will there be?

5. How much water will be produced during neutralization of
100 g of LiOH? How does the total weight of lithium hydroxide plus hydrogen fluoride starting materials compare with the weight of water plus LiF at the end of the experiment?

6. If, in the lunar excursion module propulsion system, one molecule of reacts with two molecules of hydrazine to yield three molecules of and four molecules of , write an equation for this reaction. Check your result against the equation given previously in this chapter. Count the numbers of atoms of N, H, and O on both sides of the equation. Are they the same for each kind of atom? If this is so, then the equation is said to be "balanced."

7. Calculate the molecular weights of and hydrazine. How many moles of hydrazine would be required to react with one mole of nitrogen tetroxide?

8. How many moles of hydrazine will be required to react with 500 g of ? How many grams of hydrazine will this be? How many grams of and water vapor will be ejected through the rocket nozzle? How does this compare with the original weight of hydrazine and nitrogen tetroxide?