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Lina_5913
#1 Posted : Saturday, August 07, 2021 7:51:42 PM
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Hello,

I dont seem to understand the explanation to question 53 in the altius 3 exam? how did they determine that molecular weight would be lower?

thank you,
Lina
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INSTR_Katrina_128
#2 Posted : Monday, August 09, 2021 4:31:31 PM
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Hi Lina,

I know, it seems really counterintuitive.

I'll use an analogy to explain this:

Consider 100 g of pure gold. You go get it appraised. Ooooh, you're gonna be rich!

Consider 95 g of gold tainted with 5 g of brass. Both look the same (yellow and shiny). You THINK it's still 100% gold. You go get it appraised. HEY. Why isn't it worth as much anymore?

Same idea as the question. 100% pure molecule has a HIGHER molecular weight than wet molecule. The water is "tainting" the molecule (because it is lighter) and bringing the average molecular weight DOWN.

That's the idea behind the answer.
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