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Answer:
153 g CO₂
Explanation:
To begin, the reaction is not in its simplest form. The coefficients can be divided by two. However, this will not change the answer.
CH₄ + 2 O₂ --> CO₂ + 2 H₂O
You can find the grams of CO₂ by taking the moles of O₂, using the mole to mole ratio of O₂ to CO₂ (via the coefficients), then converting moles of CO₂ to grams. You will need the molar mass of CO₂ since you want to convert it from moles to grams. This is calculated using the values on the periodic table. The ratios should be written in a manner that allows for the cancellation of units. The answer should have 3 sig figs.
12.011 g/mol + 2(15.998 g/mol) = 44.007 g/mol CO₂
6.95 moles O₂ 1 mol CO₂ 44.007 g CO₂
---------------------- x ------------------- x ------------------------- = 153 g CO₂
2 mol O₂ 1 mol CO₂