What mass of iron(III) nitrate [Fe(NO3)3] is needed to make 400mL of a 0.3M solution?

29

Explanation:

.55.85+(14.01+48.00)3

=241.88g/mol

4g*.3m=0.12

241.857*0.12=29g

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

im pretty sure its b