12. if each orbital can hold a maximum of two electrons, how many electrons can each of the following hold?
a.
b. 2s c. 5p d. 4f e. 3d f. 4d
for the following electron configurations choose 3 possible elements (or ions) they may represent
1. 1s2 2s22p6 3s23p6 4s2 3d10 4p4
2. 1s2 2s22p6 3s23p6 4s2 3d10 4p5
3. 1s2 2s22p6 3s23p6 4s2 3d10 4p6
4. 1s2 2s22p6 3s23p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s1
5. 1s2 2s22p6 3s23p6 4s2 3d10 4p6 5s24 d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d8

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.