The percentage of copper and oxygen in samples of \[CuO\] obtained by different methods were found to be the same. This illustrates the law of [AMU 1982, 92]

The percentage of copper and oxygen in samples of \[CuO\] obtained by

1.	The percentage of copper and oxygen in samples of \[CuO\] obtained by different methods were found to be the same. This illustrates the law of [AMU 1982, 92]
A.	Constant proportions
B.	Conservation of mass
C.	Multiple proportions
D.	Reciprocal proportions
Answer» B. Conservation of mass

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The percentage of copper and oxygen in samples of \[CuO\] obtained by different methods were found to be the same. This illustrates the law of [AMU 1982, 92]

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