How many moles of iron are there in 3.82x 10^22 atoms of iron?

Hey there!

There are 6.022 x 10²³ atoms of iron in one mole of iron.

So, divide 3.82 x 10²² by 6.022 x 10²³.

(3.82 x 10²²) ÷ (6.022 x 10²³) = 0.634

There are 0.634 moles of iron in 3.82 x 10²² atoms of iron.

Hope this helps!

its first and third is your answer i did the qustion the fourth isnt right

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