# Chemistry

posted by Chris

C3H8 + 5O2 3CO2 + 4H2O
How many grams of oxygen are required to burn 7.0 g of C3H8?

1. DrBob222

How do we know the difference between products and reactants with no arrow???

1. Write and balance the equation.
2. Convert 7.0 g C3H8 to moles. moles = grams/molar mass.
3. Using the coefficients in the balanced equation, convert moles C3H8 to moles O2.
4. Convert moles O2 to grams. g = moles x molar mass.

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