Answer:
1.15 x10exp-22 g
Explanation:
Calculate grams of 3 sodium atoms?
Na = 22.99 g/mole
9.08 x 10exp-20 g
0 4,50 x10exp22 g
0 1.15 x10exp-22 g
2.10 x 10exp-23 g
Na = 22.99 g/mole
a mole is a number
just like a "dozen" means 12, a mole means
6.022X 10exp23 or
6.022 X100000000000000000000000
so 22.99 g/mole is 22.99 gm /(6.022 X10exp23 )=
(22.99/6.022) X 10exp-23 =3.82 X 10exp-23 g/atom
but we have 3 atoms, so they have a total mass of
3 X 3.82 X 10ex-23gm = 11.46 X 10exp-23=
1.146 X 10 exp-22
so the answer is from the 4 choices is
1.15 x10exp-22 g
