1. A compound is found to have (by mass) 48.38% carbon, 8.12% hydrogen and 43.5% oxygen.
What is its empirical formula?

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The answer is 1.82 j/g°c                  

Aseasonal prevailing wind in the region of south and southeast asia, blowing from the southwest between may and september and bringing rain (the wet monsoon ), or from the northeast between october and april (the dry monsoon ).

Not a  mixture of two common elements that can be separated by physical means.