1. How many atoms are in 2.15 moles of water? *2. How many atoms of copper are in 12.0 grams?

*3. How many moles of NH3 contain 1.75 x 10^24 molecules of?

4. Determine the number of molecules in 16.75 g of H2O ?

5. Find the formula for a hydrate with 48.8% MgSO4 & 51.2% H2O

6. What is the % by mass of C in Pb(C2H3O2)2?

(Questions with stars just don't make sense to me.)

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

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.

How far is the region from the equator or control climate