Question

Consider the reaction of aluminum with hydrogen chloride to produce aluminum chloride
and hydrogen gas. If you react 151g of aluminum with 592g of hydrogen chloride, how much hydrogen gas could be produced, in grams?

Answer 1

balanced equation.

Answer 2

The balanced equation is 2 Al + 6 HCl = 2 AlCl3 + 3 H2

Answer 3

The equal sign shud be a yield sign

Answer 4

I found the moles of A and moles of HCl but im not sure if that's necessary

Answer 5

i think the answer is 16.9 because the HCl is the limiting reactant right?

Answer 6

16.9g H2

Answer 7

write the balanced eqn. find the Limiting reactant.

Answer 8

convert hcl to moles then mole mole ratio then mass h2

Answer 9

Aluminum is the limiting reagent i think since its 0.55 mol and HCl is 16.24 mol

Answer 10

How did u get 16.9. like what were ur steps

Answer 11

16.4 sorry

Answer 12

yeah that is teh right answer b/c i have teh asnwer key but i dont understand how to get taht answer

Answer 13

well i determined the theoretical yield of h2 produced from the balanced eqn

Answer 14

and you to that by

Answer 15

taking 151g Al, convert to moles, (times)mole ratio of aluminum to h2, then multiply by the mass of h2

Answer 16

and that will give you the mass of h2 produced.

Answer 17

but you also have 592g HCl so u do the same exact thing except with HCl

Answer 18

THE SMALLER NUMBER IS THE THEORETICAL YIELD or the amount that can be produced by the reaction

Answer 19

theoretically

Answer 20

so i got 0.55 mol Al. Now I multiple it by (3 H2/ 2 Al) = 0.825 mol H2 and
16.24 mol HCl 8 (3 mol h2/ 6 mo HCl) = 8.12 mol HCl.

Answer 21

ok reset bro start with grams Al

Answer 22

i mean HCl is limiting reagent right? then u multiply 8.12 * 2 = 16.24 g

Answer 23

yeah

Answer 24

8.2 is the number of moles of hydrogen

Answer 25

ok just alittle confusion. Why is the larger number of moles the limiting reagent?

Answer 26

because mole mole ratio changes it

Answer 27

Oh I get it now! Thanks :)

Answer 28

yeah so for this problem start with grams, goto moles, and back to grams. also make sure you keep track of units

Answer 29

units are very important

Answer 30

youre welcome btw. take a look at the question i posted if u know where to start

Answer 31

lmk

Answer 32

ok sure