Homework Help: Chemistry

Posted by Jessie T on Tuesday, September 8, 2009 at 4:22pm.

Did I do these right? Can someone let me know if I did them correctly? I had someone help me with the problems but know I want to make sure their the right answers?

1. Methane burns in oxygen according to the following equation:
CH4 + 2O2 ----> CO2 + 2H2O
What is the mass of CO2 produced when 3.4 grams O2 reacts according to the above reaction?
a. 4.7g
b. 4.9g
c. 2.3g
d. 9.4g
e. 0.74g
After doing the calculations I got 2.3g, is that correct? Did I do that right?

2. Determine the number of moles of MgO that form from the reaction of 4.4 moles of O2 in the following unbalanced reaction:
Mg + O2 ----> MgO
The balanced equation I get is:
2Mg + O2 ----> 2MgO
a. 1.1 moles
b. 4.4 moles
c. 17.6 moles
d. 2.2 moles
e. 8.8 moles
What I get after doing the calculations is d. 2.2 moles, is that correct? Did I do that right?

No one has answered this question yet.

Answer this Question

Related Questions

english - 1.Which one following sentence is puntuated correctly. A.I saw many of...
math - Divanna scored 67% on her last test, If she had paid closer attention to ...
algebra - divanna scored 67% on her test. IF she had paid closer attention to ...
AP physics - do you guys have an someone that good with advanced physics, ...
history - To me everyone is the same and by having someone under someone else it...
Algebra - 6x²y³ + 9x²y³ 15x²y³...
Chemistry - Unfortunately I was hit by the sweep of illnesses going around due ...
Algebra 1 - Can someone help me solve this problems please? Thank you very much ...
proofread my essay? - If I post my rough draft of an essay on here, can someone ...
Chemistry - hi I'm having a serious problem with balancing chemical ...

For Further Reading

First Name:
School Subject:
Answer: