Monday
October 20, 2014

Homework Help: Chemistry 130

Posted by Jessie on Tuesday, September 8, 2009 at 1:27pm.

Will someone help me by letting me know if I did these correct, or if there the correct answers? Thanks!

2 (10). If two moles of hydrogen gas (H2) react in the following equation, how many moles of H2O will be formed?
2H2 + O2 2H2O
a. 2 moles
b. 4 moles
c. 1 mole
d. 8 moles
e. 36 moles
I believe this is a. 2 moles, is that correct?

3 (11). The amount of product that should be produced based on stoichiometric calculations is theK.
a. Actual yield
b. Theoretical yield
c. Percent yield
d. Minimum yield
e. Scientific yield
I have b. theoretical yield, is that correct?

4 (12). In an experiment, a laboratory technician produced 4.59 grams of O2 when 4.89 grams of O2 was supposed to be formed based on stoichiometry of the reaction. What was the percent yield for this experiment?
a. -6.1%
b. 106%
c. 93.9%
d. 6.1%
e. 54.3%
I believe this is c. 93.9%, is that right?

5 (13). An alkaseltzer tablet is massed at 3.4 grams. In a beaker, 10.0 grams of water are massed. The tablet and water are carefully placed in a Ziploc bag without mixing and the bag is sealed. The tablet and the water are mixed resulting in fizzing and the bag filling up with gas. What will the total mass in the bag be when the reaction is complete?
a. 3.4 grams
b. 10.0 grams
c. 13.4 grams
d. 6.6 grams
e. More information is needed
I have this one as c. 13.4g, is that correct?

7 (17). Determine the number of moles of MgO that form from the reaction of 4.4 moles of O2 in the following unbalanced equation:
Mg(s) + O2(g) MgO(s)
a. 1.1 moles
b. 4.4 moles
c. 17.6 moles
d. 2.2 moles
e. 8.8 moles
I believe this one is b. 4.4 moles, is that right?

Thank you for the help ;-)

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

AP Chemistry - My objective is to find the molar mass of a gas. Is this the ...
Ap Chemistry - Posted by Jake on Sunday, September 23, 2007 at 1:08pm. My ...
chemistry - If a mole of hydrogen gas (H2) contains 6.02 x 10^23 molecules, how ...
Chemistry - Did I do these right? Can someone let me know if I did them ...
Chemistry - 1. A sample of argon gas is at a pressure of 1.24 x 10^4 kPa and a ...
chemistry - 2H2(g) + S2(g) 2H2S(g) Analysis of the contents of a 15.0L flask ...
chemistry - Zinc combines with hydrochloric acid to form aqueous zinc chloride ...
Chemistry - How many moles of water can be made from 4 moles of oxygen gas and ...
Chemistry - How many moles of water can be made from 4 moles of oxygen gas and ...
chemistry - Given a sufficient supply of nitrogen gas, how many moles of ammonia...

Search
Members