# chemistry

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1)The reaction of methane and oxygen yields carbon dioxide gas and water. The unbalanced reaction is as follows: CH4(g) + O2(g)CO2(g) + H2O(g)

A. If 0.718 grams of methane are reacted, how many grams of water vapor are produced?

B. If 1.621 grams CO2 are released, how many grams of methane were reacted?

2)Write a balanced equation for the following reduction-oxidation reaction.

SO3–2 + MnO4–SO42– + Mn2+

• chemistry -

1A).
Place an arrow where it belongs in the equation. Then balance it.
2. Convert grams you are given to moles. # moles = grams/molar mass.
3. Using the coefficients in the balanced equation, convert moles of what you were given to moles of water.
4. Convert moles water to grams. g = moles x molar mass.

1B. Use the same kind of procedure. This will work most stoichiometry problems.

#2. How much do you know about balancing redox equations. Here are a couple of hint to get you started.
S changes from +4 on the left to +6 on the right. Mn changes from +7 on the left to +2 on the right. You can make the problem simpler by using an arrow where it belongs. You do an arrow with --- and > or ===>.
Post your work if you get stuck.

• chemistry -

i don't know if this is right, 2SO3–2 + MnO4 yield 4SO42– + 2Mn2+

• college -

sienes