substance δh°f (kj/mol)
so2 (g) −297
hope this !
1- 5 grams of h2
2- 5 liters of ch4
3- 5 moles of o2
4- 5x10^23 molecules of co2 (g)
(a) 1s² 2s²2p³; (b) 1s² 2s²2p⁶ 3s²3p⁶ 4s²3d²; (c) 1s² 2s²2p⁶ 3s²3p⁵
one way to solve this problem is to add electrons to the orbitals one-by-one until you have added the required amount.
fill the subshells in the order listed in the diagram below. remember that an s subshell can hold two electrons, while a p subshell can hold six, and a d subshell can hold ten.
(a) seven electrons
there are two electrons in the 2s subshell and three in the 2p subshell. the remaining two electrons are in the inner 1s subshell.
(b) 22 electrons
1s² 2s²2p⁶ 3s²3p⁶ 4s²3d²
there are two electrons in the 4s subshell and two in the 2p subshell. the remaining 18 electrons are in the inner subshells.
(c) 17 electrons
1s² 2s²2p⁶ 3s²3p⁵
there are two electrons in the 3s subshell and five in the 2p subshell. the remaining 10 electrons are in the inner subshells.