
Sometimes conversions seem troublesome, they do get easier with practice (like most things). If your notes are not handy review the example below. Sample conversion You just bought a 25 lb watermelon. It is 92% water. How many grams of water have you just purchased? Conversion factors: Watermelon = 92% water ( 1 lb melon = 0.92 lb water contained); 1kg = 2.2 lbs; 1000 g = 1 kg;
If melon is on top in the first box you want in below in the second set of boxes. The relationship that has melon in it is 1 lb melon would give 0.92 lbs water. That is the meaning of 92% water.
Then continue cancel lbs of water on top with a relationship (conversion factor) with lbs in it. That relationship is 2.2 lbs equals 1 kg. Now these units cancel
Now we need to get rid of kg. We can look up the relationship 1kg equals 1000 grams. Put the kg part on bottom so it will cancel kg's that we have on top
The only units or labels not cancelled in g of water, which is exactly what the problem is asking for. When the units work out, you know that the setup has to be correct. Now multiply the entire numerator across. Multiply the denominator across and divide the numerator by the denominator.
=10,454 g of water. Rules:
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