Balance the following equations.<?xml:namespace prefix = o ns = \"urn:schemas-mi

ID: 794665 • Letter: B

Question

Balance the following equations.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

1. H2 + O2 ! H2O

2. Mg + O2 ! MgO

3. SF4 + H2O ! SO2 + HF

4. P4 + O2 ! P2O5

5. C3H8 + O2 ! CO2 + H2O

6. Recall the stoichiometric coefficients (the numbers before the individual species) in a

balanced chemical reaction refer to the number of moles of that species involved in the

chemical reaction. A balanced chemical equation shows the molar relationship between all

of the reactants and products. Now, given the following chemical equation:

3 Cu + 8 HNO3 6 3 Cu(NO3)2 + 2 NO + 4 H2O

a. Is this equation balanced? (Yes / No)

b. How many moles of HNO3 are required to react with 6 moles of Cu?

c. How many moles of Cu(NO3)2 are produced when 3 moles of Cu react?

d. How many moles of Cu must react to produce 4 moles of NO?

e. If 4 moles of NO are produced, how many moles of H2O are also produced?

7. Propane, C3H8, is commonly used as a fuel in gas grills. It reacts with oxygen according to

C3H8 + 5 O2 6 3 CO2 + 4 H2O

How many grams of propane can be burned by 24 g of O2?

8. Lead (II) oxide, PbO, reacts with ammonia, NH3, as follows:

3 PbO + 2 NH3 6 3 Pb + N2 + 3 H2O

How many grams of Pb are formed when 0.105 g NH3 react?

9. Lithium hydroxide absorbs carbon dioxide forming lithium carbonate and water.

2 LiOH + CO2 6 Li2CO3 + H2O

If a reaction vessel contains 0.15 moles of LiOH and 0.08 moles CO2, which compound is

the limiting reagent?

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