The molar mass of two equally sized samples of unknown gaseous compounds is shown in the table. Molar Mass Comparison
Gas Molar Mass
X 28 g/mol
Y 44 g/mol
At STP, which describes the density and effusion of both gases? (4 points)

a
Gas X has a higher density and effuses faster than Gas Y.

b
Gas X has a higher density and effuses slower than Gas Y.

c
Gas X has a lower density and effuses slower than Gas Y.

d
Gas X has a lower density and effuses faster than Gas Y.

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.

What is the correct lewis structure for chloroform chcl3

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules