When do you assume something is diatomic?

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starsweet

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So obviously I know BrINClHOF, but Kaplan had a question about the number of molecules in 20 g of oxygen gas. I immediately assumed it was diatomic (esp. since it said "oxygen gas") but the explanation used 16 g/mol to convert the 20 g to molecules. Why did they use 16 g/mol and not 32 g/mol?
 
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starsweet said:
So obviously I know BrINClHOF, but Kaplan had a question about the number of molecules in 20 g of oxygen gas. I immediately assumed it was diatomic (esp. since it said "oxygen gas") but the explanation used 16 g/mol to convert the 20 g to molecules. Why did they use 16 g/mol and not 32 g/mol?
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Kaplan has a lot, and I mean a lot, or errors and typos. This is a serious problem for doing calculations. I honestly believe that in that problem you should use 32g/mol. Oxygen gas is diatomic.
Oxygen

"Oxygen, O2, is a colourless odourless gaseous main group element which belong to Group VIb of the periodic table.
Atomic Number : 8
Atomic Mass : 15.9994
Melting Point : -214 degC
Boiling Point : -183 degC
Density : 1.429"

Just know Brinclhof 😉
 
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I was doing that EXACT same problem yesterday. I used 32 in my calculations but Kaplan said it was 16. That's one thing I hate about Kaplan, all the typos and calculation errors. I mean, you would think Kaplan could afford someone to look over the book before they publish it. It's just annoying b/c your not sure whether your way is the right way or not! I wonder if other study guides (Barrons, Petersons, Princeton, Exam Crackers, Lippencotts, etc) have the same problem with typos and calculation errors.
 
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No kidding, it's ridiculous! I may write them a nastygram once this test is over... 🙄

I just didn't want to get a simple problem like that wrong, so I wanted to make sure I was right in using BrINClHOF.
 
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hi...even i was doing that one last night.....and i asumed it was diatomic...and guess what i was wrong...

But now that u all have clarified it...i'm genious.... 😉 😀 :laugh:
 
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ndearwater said:
Kaplan has a lot, and I mean a lot, or errors and typos. This is a serious problem for doing calculations. I honestly believe that in that problem you should use 32g/mol. Oxygen gas is diatomic.
Oxygen

"Oxygen, O2, is a colourless odourless gaseous main group element which belong to Group VIb of the periodic table.
Atomic Number : 8
Atomic Mass : 15.9994
Melting Point : -214 degC
Boiling Point : -183 degC
Density : 1.429"

Just know Brinclhof 😉
Click to expand...

What is Brinclhof??????????
 
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