In level 1, you balanced the equation n2 h2 → nh3. what number did you place in front of ammonia (nh3)? in level 2, you balanced the equation c h2o → ch4 co2. what number did you place in front of carbon dioxide (co2)? in level 3, you balanced the equation nh3 o2 → no2 h2o. what number did you place in front of water?