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April 17, 2015

April 17, 2015

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

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?

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