17) 8.4 / 20 x 100
18) 20 . 0.5150
19) 6,50% because (as you said) the law of definite proportions states that regardless of the amount, a compound is always composed of the same elements in the same proportion by mass
As the gas cools it condenses and becomes a liquid its atoms also become smaller
Yes it does, its derived from the greek name for beryl, or beryllo
Answer:
3
Explanation:
calcium (Ca)
carbon(C)
oxygen(O)
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