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Comparison of Two Unknown Compounds: Are They Identical?

This analysis investigates two unknown compounds to determine if they are the same substance. Compound I contains 15.0 g of hydrogen and 120.0 g of oxygen, while Compound II has 2.0 g of hydrogen and 32.0 g of oxygen. By calculating the percentages of hydrogen and oxygen in each compound, we find that Compound I has 11.1% hydrogen and 88.9% oxygen, whereas Compound II has 5.9% hydrogen and 94.1% oxygen. The stark differences in composition lead us to conclude that they are not the same. Further, we explore magnesium oxide's composition from the reaction of magnesium and oxygen.

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Comparison of Two Unknown Compounds: Are They Identical?

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  1. Pg 76 #23 Two unknown compounds are tested. Compound I contains 15.0g of hydrogen and 120.0g of oxygen. Compound II contains contains 2.0g of hydrogen and 32.0g of oxygen. Are they the same compound? H + O = C (I) 15.0g + 120.0g = 135.0g % H = 15.0g x 100 = 11.1 % 135.0g %O = 120.0g x 100 = 88.9% 135.0g

  2. H + O = C (II) 2.0g + 32.0g = 34.0 g % H = 2.0g x 100 = 5.9% 34.0g % O = 32.0g x 100 = 94.1 % 34.0g Are they the same compound?

  3. Pg 76 #24 All you know about 2 unknown compounds is that they have the same percent by mass of carbon. With only this information, can you be sure the two compounds are the same?

  4. Magnesium combines with oxygen to form magnesium oxide. If 10.57g of magnesium reacts completely with 6.96g of oxygen. What is the percent by mass of oxygen in the magnesium oxide? Mg + O = MgO 10.57g + 6.96g = 17.53g %O = 6.96gx 100 = 39.7% 17.53g

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