# Homework Help: Is it the metal in my above balanced equation ?

1. Dec 13, 2016

### Starrrrr

1. The problem statement, all variables and given/known data
Part one : A number of metals react with HCl to form salts of general formula MCl2.
Write a balanced chemical equation for such a reaction.

After a piece of one of these metals had reacted completely with the acid in 55.8 cm3 of 1.24M HCl, the resulting solution, which conducted electricity, was evaporated to dryness. The residue had a mass of 4.72g.

Part Two:
Part two: What is the atomic number and name of the metal?

2. Relevant equations
N/A

3. The attempt at a solution

So for part one I did : Mg+2HCL>MgCl2+H2

Then for part two is it the metal in my above balanced equation ? Simple yes or no answer

Thanks!

2. Dec 14, 2016

### Bystander

How many moles?

3. Dec 14, 2016

### Starrrrr

H+=0.0692 moles/L and Mg=0.0346 moles

4. Dec 14, 2016

### Bystander

5. Dec 14, 2016

### Staff: Mentor

It would be better to use symbol Me (as in generic Metal) than Mg - at this stage you don't know the identity of the metal.

What is the mass of 0.0346 moles of MgCl2? Does it confirm the identity of the metal?