Posted by **Rara** on Tuesday, October 4, 2011 at 8:09pm.

How many milliliters of a 0.3 molar HCl

solution are needed to react completely with

8 grams of zinc according to the following

equation?

? HCl + ? Zn → ? ZnCl2 + ? H2

Answer in units of mL

- DR.BOB HELP CHEMISTRY! -
**drwls**, Tuesday, October 4, 2011 at 8:27pm
First, you need to balance the equation. Can you do that?

You will need two moles of HCl per mole of zinc.

Ask yourself this question:

How many moles of zinc is 8 grams?

- DR.BOB HELP CHEMISTRY! -
**Rara**, Tuesday, October 4, 2011 at 8:34pm
I balanced it and got:

2HCL + Zn ---> ZnCl2 + H2

And then to find moles I did: 8/65.37 and got 0.1124 moles.

But now I'm stuck, what do I do next?

- DR.BOB HELP CHEMISTRY! -
**drwls**, Tuesday, October 4, 2011 at 8:49pm
You are doing fine so far.

You need 2*0.1124 = 0.2248 moles of HCl.

One liter of the solution contains 0.3 moles of HCl.

You need a bit less than a liter of the acid solution.

- DR.BOB HELP CHEMISTRY! -
**Rara**, Tuesday, October 4, 2011 at 8:52pm
Okay, so would I divide 0.3 by 0.2248? >_> I'm sorry, my chemistry is my weakest subject. :(

- DR.BOB HELP CHEMISTRY! -
**drwls**, Wednesday, October 5, 2011 at 1:06am
No, you need less than a liter.

## Answer This Question

## Related Questions

- chemistry - How many milliliters of a 0.5 molar HCl solution are needed to react...
- chemistry - How many milliliters of a 0.5 molar HCl solution are needed to react...
- chemistry - How many milliliters of a 0.5 molar HCl solution are needed to react...
- Ap Chem - how many milliliters of a 0.9 molar HCl solution are needed to react ...
- Chemistry - how many mililiters of a 0.4 molar HCl solution are needed to react...
- Science - how many mililiters of a 0.4 molar HCl solution are needed to react ...
- chemistry - The UNBALANCED equation is: Zn + HCl –] ZnCl2 + H2 How many ...
- chemistry - how many mililiters of a 0.27 M HCl solution are needed to react ...
- science - How many grams of hydrochloric acid are required to react completely ...
- chem - How many grams of zinc metal will react completely with 8.2 liters of 3.5...

More Related Questions