25 ! a group of engineers run a trial test on a space probe built for measuring the surface temperature of the sun. after the trial, the engineers realize that the probe melted and failed to collect the needed data. what should the engineers do next?

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted