What is the chemical formula of calcium chloride?

➷ It would be CaCl2

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Explanation:

Atomic number of calcium is 20 and its electronic configuration is 2, 8, 8, 2. So, to acquire stability it loses 2 valence electrons and hence forms ion.

Whereas atomic number of calcium is 17 and its electronic distribution is 2, 8, 7. To attain stability its needs to gain one electron and hence then it forms ion.

Therefore, when both calcium and chlorine chemically combine together then they will form calcium chloride, that is, .

Thus, we can conclude that the chemical formula of calcium chloride is .

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