Question

How many grams of magnesium metal will react completely with 4.8 liters of 5.0 M HCl? Mg (s) + 2 HCl (aq) yields MgCl2 (aq) + H2 (g)

Answer 1

\(\large\sf Mg+2HCl \to MgCl_2+H_2\)

First calculate the amount of moles HCl, Do you know how to do that?

Answer 2

I am completely lost.

Answer 3

Do you know what 5.0M HCl means?

Answer 4

Yeah

Answer 5

well?

Answer 6

I know what it means but not the answer.

Answer 7

It means 5 mol per liter
We have 4.8 liter, how many moles do we have?

Answer 8

29?

Answer 9

5*4.8= 24
So we have 24 mol HCl

Do you know the ratio of the reaction?

Answer 10

oops clicked the wrong number on the calculator. No i dont know the ratio

Answer 11

1 mol Mg reacts with 2 mol HCl to produce 1 mol MgCl2 and 1 mol H2
So 1:2;1:1

For every mole Mg, 2 moles HCl are used
We have 24 mol HCl, how many moles Mg are used?

Answer 12

12

Answer 13

That's correct
Now we only have to convert that to grams
To do this, multiply with the molar mass of magnesium

Answer 14

12x24
288?

Answer 15

Almost, the molar mass of Mg is 24.305
So that would be 12*24.305= 291.66 gram

Answer 16

Ok, then what?

Answer 17

That is the answer :)

Answer 18

the amount of grams Mg that will react with 24 mol HCl

Answer 19

Thank you

Answer 20

You're welcome