Asap (: need with these 3 1. what mass of h2 would be needed to produce 208kg of methanol? 2. how many grams do 1.3 x 10^21 atoms of sodium weigh? 3. using the average atomic mass, calculate the number of atoms present in 1.2 ml of liquid mercury. (density= 13.6g/ml)

If the particles in a sample of matter have an orderly arrangement and move only in place, the sample is a

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.

This drawing shows a human body system. what is the primary function of this body system?