A5 m long vertical tube having cross sectional area of 200 cm^2 is completely filled with water at room temperature. calculate the mass of water present in the tube. density of water at room temperature is 1000 kg/m^2

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.

Find the number of moles of argon in 364g of argon.

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false