PLEASE HELP ME, 20 POINTS How many atoms are in 25.00 g of Li.

Question 1 options:

2.393 x 1024 atoms of Li

1.333 x 1023 atoms of Li

2.16 x 1026 atoms of Li

2.17 x 1024 atoms of Li

How many grams is 2.393 x 1024 atoms of Cl

Question 2 options:

70.45 g Cl

140.9 g Cl

140.9 mole Cl

70.45 mole Cl

How many atoms are in 25.00 g of B.

Question 3 options:

1.393 x 1024 atoms of B

1.333 x 1023 atoms of B

2.16 x 1026 atoms of B

2.17 x 1024 atoms of B

How many grams is 2.393 x 1024 atoms of O

Question 4 options:

70.45 g O

140.9 g O

63.58 mole O

63.58 g O

Can someone me with these questions plz.

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.

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?