We're asked to find the mass (in
To solve mass-mass stoichiometry problems like this one, we always use three steps:
- Calculate the moles of the substance with known mass
#"CO"_2#using its molar mass.
- Use the coefficients of the balanced chemical equation to find the relative number of moles of the substance in question.
- Use the molar mass of that substance to find its mass, in
Let's first calculate the number of moles of carbon dioxide, using its molar mass (
Now, using the coefficients of the equation, let's find the relative number of moles of the substance in question,
Finally, let's calculate the number of grams of ethylene, using its molar mass (
rounded to two significant figures, the amount given in the problem (assuming the
Thus, in order to produce