Asked by Anonymous

A 10.000 g sample of water contains 11.19% H by mass. What would by the %H in a 20.000 g sample of water?

I got 22.38%, would that be correct?
Answered by DrBob222
No. The answer is NOT twice 11.19.
Answered by Anonymous
Would it be 5.560%?
Answered by DrBob222
No. The answer isn't 1/2 of 11.19 either. Your guessing. If you have 5g apples and 5g oranges (10 g total), percent apples is ?. If you have 100g apples and 100g oranges (200 g total), percent apples is ?
If you have 25g apples and 25g oranges(50 g total), percent apples is ?. If you have 1,000 g apples and 1,000 g oranges (total 2,000g), percent apples is ?.
Answered by Anonymous
Okay, that makes since. The % amount of hydrogen in water is going to stay the same no matter how many grams of water you have.
Answered by DrBob222
That is exactly right. That problem set a trap and you fell for it. The GRAMS of H in a 20 g sample will be different than the grams in a 10 g sample but the % stays the same.
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