Which of the following statements is NOT true?
A) Given that the chemical formula of methanol is CH4O, the number of carbon atoms in a sample of methanol will be the same as the number of oxygen atoms.
B) If a compound is 75% carbon and 25% hydrogen by mass, 12 g of the compound contains 9 g C and 3 g H.
C) If a compound contains 76 g of chlorine and 12 g of carbon, it will always have a 6.33:1 mass ratio of Cl to C.
D) A compound containing 17.1 g of phosphorus and 58.9 g of chlorine has the same identity as a compound containing 35.7 g P and 204.3 g Cl.
E) A compound containing 106.6 g of copper and 13.4 g of oxygen has the same identity as a compound containing 159.9 g Cu and 20.1 g O.
Correct Answer:
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A)must be composed of
Q9: According to the law of definite proportions,_
A)atoms
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Q15: Which of the following is an element?
A)C6H12O6
B)HNO3
C)NaCl
D)CH4
E)O3
Q16: Which of the following is a pure
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