8. When 15 grams of H2O decomposes how many grams of O2 are formed?

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To determine how many grams of O2 are formed from the decomposition of 15 grams of H2O, one must calculate the mass ratios of hydrogen and oxygen in water. The molecular weight of water is derived from the weights of its constituent atoms: two hydrogen atoms (1.008 g each) and one oxygen atom (16.00 g). The ratio of oxygen to water is 16.00 grams of oxygen for every 18.016 grams of water. By applying this ratio, the calculation reveals that approximately 13.3 grams of O2 are produced from 15 grams of H2O. Understanding these ratios is crucial for solving similar problems, especially when unit conversions are involved.
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[SOLVED] 8. When 15 grams of H2O decomposes how many grams of O2 are formed?

Here's the question:

When 15 grams of H2O decomposes how many grams of O2 are formed?

I have no idea how to even start that problem...I guess I missed that part in Chem class. *sighs*
 
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You need to ratio the weights of the constituent parts of water. How much does a hydrogen atom weigh? How much does an oxygen atom weigh?
 
russ_watters said:
You need to ratio the weights of the constituent parts of water. How much does a hydrogen atom weigh? How much does an oxygen atom weigh?

Adding to this, the teacher will probably have the question on a test but it will be in pounds or ounces. Most people dick around with converting from grams to ounces, because they forget that ratios do not have units. Divide the units you know, which are probably grams, then apply that ratio to whatever units the question has. It could be grams, it could be pounds, it could be anything.
 
Each (1.008 + 1.008 + 16.00) mass of water contains (16.00) mass of oxygen. Now you have enough information for the ratio and the calculation for how much oxygen by mass is simple.
 
Thanks everyone...I think I've got in now. I really appreciate you help. 8)
 
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