A sample of a gas with a volume of 745 cm3 at a temperature of 35.0°C and pressure of 100 kPa has a mass of 2.51 g. The gas is 83.6% carbon and 16.4% hydrogen by mass. The molecular formula of the gas would be C_H_.

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.

If a solution had a ph of 7 what is the solution

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.