Limiting Reactant and gases

[puma7]

Homework Statement

3.50 g of magnesium metal is added to 100. mL of 2.00 M aqueous hydrochloric acid. The substances react to completion, producing aqueous magnesium chloride and hydrogen gas (H2). How many liters of pure hydrogen gas, measured at 0.00^oC and 1.00 atm are produced in this reaction?

Homework Equations

PV=nRT

The Attempt at a Solution

Rxn Eq: 2Mg + 2HCl --> 2MgCl + H₂

3.5 g Mg x (1 mol/24.3g) = .144 mol Mg
2 mol/L HCl x .1L = .2 mol HCl
Mg is limiting reactant

.144 mol Mg x (1 mol H₂/2 mol Mg) = .072 mol H₂

V=(nRT)/P=[(.072)(.08206)(273)] / 1 = 1.61 L H₂

It says the answer is 2.24L?

 

[Borek]

What is formula of magnesium chloride?

Spoiler

Hint: which periodic table group?

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[puma7]

WOW! I can't believe I missed that. I always miss these on minor mistakes that don't even have to do with the difficult part... Thanks