What is the square root of a negative number

It depends, but this is how I would do it:

Let's take the square root of -8 -->

First, I would take out an "i" and put it outside of the square root:

The i represents the negative sign. Then, I would treat the square root of 8 as a normal problem and simplify by factoring it:

Factors of 8: 2,2,2

Because you're looking for a square root and you can "loop" two 2s together, you can take one set out:

would be your final answer.

Hope I helped :)

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

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