Based on the electron configuration of the two atoms, predict the ratio of metal cationic (+) atom
to nonmetal anionic (-) atom in the compound.
Beryllium 1s22s2
Chlorine 1s22s22p%3s23p5
A. 2:3
B. 1:2
C. 2:1
D. 3:2

thats a little if u want the answer just look it up on google thats what i do haha : )

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