11 12
56
7. How many atoms are in 0.250 moles of Rb? x 6.02x102 atoms
1 mol
8. How many moles are in 2.91 X 1022 atoms of He? X
1 mol
6.02 x 104 atoms
9. How many moles are in 1.23 X 1050 molecules of H,?
1 mol
6.02 x 10-molecules
10. How many moles are in 5.25 X 1025 atoms of Au? X
1 mol
6.02 x 1023 atoms
1 mol
11. How many moles are in 7.14 X 1035 molecules of O,? *
6.02 x 10-molecules
12. How many moles are in 8.11 X 1020 molecules of CH.? X
1 mol
6.02 x 1023
molecules
Il

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )