As part of an experiment, a student burns propane (c3h8) to produce carbon dioxide (co2) and water (h2o). she remembers that she must follow the law of conservation of matter when writing a balance chemical equation. which of these equations adheres to the law of conservation of matter? a) c3h8 + o2 -> co2 + h2o b) c3h8 + o2 -> 3co2 + h2o c) c3h8 + 3o2 -> co2 + 4h2o d) c3h8 + 5o2 -> 3co2 + 4h2o