Octane (c8h18) undergoes combustion according to the following thermochemical equation: 2c8h18(l) + 25o2(g) → 16co2(g) + 18h2o(l), δh°rxn = –11,020 kj/mol. Given that δh°f[co2(g)] = –393. 5 kj/mol and δh°f[h2o(l)] = –285. 8 kj/mol, calculate the standard enthalpy of formation of octane.

Name and describe how to implement one method of embellishment.

Alex is the head photographer for the yearbook and the newspaper. she has a large staff of assistant photographers because they need to take pictures at all of the school events. she knows that some of her photographers have better cameras and can take action shots at sporting events, and that some of them are good at taking candid pictures in the hallways. she sets firm deadlines so she has enough time to look through all of the shots and choose the best ones. she gives her photographers constructive feedback to them improve their pictures. respectful enforcer warlord doormat peacemaker

Rick is on a bicycle trip. every 4 days he bikes 230 km. if rick keeps this same pace for 16 days, how many kilometers will he bike?