Limiting Reactant and gases

  • Thread starter puma7
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  • #1
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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 0.00oC 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?
 

Answers and Replies

  • #2
Borek
Mentor
28,705
3,194
What is formula of magnesium chloride?

Hint: which periodic table group?

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  • #3
4
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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
 

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