Which statement is true about the compound ammonium sulfate [(nh4)2so4] ?

it is a salt of two polyatomic ammonium ions and one polyatomic sulfate ion.

it is a mixture of three polyatomic ammonium ions and a polyatomic sulfate ion.

it is a mixture of two monatomic nitrogen and hydrogen ions and one polyatomic sulfate ion.

it is a salt of monatomic nitrogen, hydrogen, sulfur, and oxygen ions.

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.

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.

How do limiting factors most affect population size? ostop population growthrestrict population growthincrease population sizeresult in positive impactso