What is the hydrogen ion concentration of a solution ph’s being 4.18??? pls help!!!

[H+]=10−4.18⋅mol⋅L−1

Explanation:

By definition, pH=−log10[H+]; equivalently, pH=−log10[H3O+].

We take antilogs

[H3O+]=10−4.18⋅mol⋅L−1=6.61×10−5⋅mol⋅L−1.

apologize if it is hard to read

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