Use the information and table to answer the following question. The data in the table represents unknown element samples.
Using your knowledge of periodic properties and trends, how would these elements BEST be classified and why?
O A. Elements W and Z are nonmetals, Elements X and Y are metals, but Element Y is in Group 1 (alkali metal).
O B. Elements W and Z are metals, Elements X and Y are nonmetals, but Element X is in Group 18 (noble gas).
O C. Elements W and Z are metals, Elements X and Y are nonmetals, but Element Y is in Group 18 (noble gas).
D.) Elements W and Z nonmetals, what element W is in group 17(halogen) Element X and Y are metals

2b2t

explanation:

2b2t

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