# Gen College Chemistry

2AL+6H-->2AL+3H.

What volume of hydrogen gas at STP would be evolved in a reaction of 36.0mg of 98% pure aluminum with the hydrogen being an ideal?

I got the ml of hydrogen, but I don't know how to work it with AL being 98%pure.

1. 👍 0
2. 👎 0
3. 👁 142
1. equation does not make sense as typed.
Perhaps:
2Al + 6 H+ ---> 2 Al+3 + 3 H2(gas)
The aluminum is 98 % pure
so we really have .98*36 =35.3 mg of Al
How many moles of Al is that?
Al is 27 grams/mol
so we have 35.3 *10^-3 g / 27 g/mol = 1.31 * 10^-3 mol of Al
I get 3 moles of H2 for every 2 moles of Al
so moles of H2 = (3/2)(1.31*10^-3) = 1.96 *10^-3 mol of H2
at STP an ideal gas is about 22.4 liters/ mole
so
1.96 *10^-3 mol * 22.4 L/mol = 43.9^10^-3 L = .0439 L = 43.9 mL

1. 👍 0
2. 👎 0
posted by Damon
2. Thanks so much! Sorry about the equation, it was 3 H2.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Chemistry 171 Lab

Suppose we collect hydrogen gas, H2(g), over water at 21◦C in a vessel with total pressure of 743 Torr. If the hydrogen gas is produced by the reaction of aluminum with hydrochloric acid: 2Al(s) + 6HCl(aq) → 2AlCl3(aq) +

asked by Rae on June 15, 2016
2. ### chemisrty

what volume of hydrogen gas at STP can be produced by reacting 15.0 grams of uluminum with sulfuric acid? the equation is: 2Al+ 3H2SO4---> Al2(SO4)3+ 3H2

asked by kim on March 29, 2012
3. ### chem

In the equation: 2Al+6HCl-->2AlCl3+3H2 Why is the hydrogen by itself instead of the chlorine? Al is above hydrogen in the activity series (sometimes called the electromotive force series); therefore, it replaces H. This is single

asked by Amie on March 18, 2007
4. ### chemistry

Hydrogen gas can produced by the reaction between metallic aluminum and aqueous hydrochloric acid 2Al+6HCl----2AlCl3+3H2 Hydrogen gas produced by this reaction is typically collected via water displacement, during which time the

5. ### Chemistry

What minimum volume of 3.0 M H2SO4 is required to produced 13 L of H2 at STP? Reaction formula: 2Al(s) + 3H2SO4(aq) --> Al2(SO4)3(aq) + 3H2 (g)

asked by Diva on December 4, 2011
6. ### Chemistry

calculate the delta G^o and Kc for the reaction: 2Al + 3I2 = 2Al^3+ + 6I-

asked by Mary on May 9, 2017
7. ### Chemistry 11

What is the concentration of the solution formed when zinc metal is reacted with 950.0 cm3 of 1.25 M hydrochloric acid? What is the volume of hydrogen gas (at stp) that is evolved in the same reaction?

asked by Dawn on July 19, 2018
8. ### chem 3A

please help me with these homework problems from chemistry because the teacher did not give enough information to some of these chemistry work problems. 1) 50.0 g of aluminum is reacted with excess sulfuric acid. The chemical

asked by shylo on July 25, 2008
9. ### chemistry

Consider the following reaction: 2H2 (g) + O2 (g)  2H2O (l) ΔH = -572 kJ a. How much heat is evolved for the production of 1.00 mol H2O (l)? b. How much heat is evolved when 4.03 g hydrogen is reacted with excess oxygen? c.

asked by Anonymous on November 9, 2012
10. ### Chemistry

If you have Hydrochloric acid, how many grams of aluminum must you use to produce 57.0 L of hydrogen at STP? 2Al(s)+6HCl(aq) --> 3H2(g)+2AlCl3(aq)

asked by Brittany on December 8, 2010

More Similar Questions