A25-ml sample of 0.160m solution of naoh is titrated with 17 ml of an unknown solution of
h2
so4
. what is the molarity of the sulfuric acid solution?
a. 0.235m h2
so4
b. 0.117m h2so4
c. 0.004m h2
so4
d. 0.002m h2so4

Which best describes how johannes kepler developed his laws of planetary motion

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.

Ineed to find the answer of this question because i dont understand it