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Pg 76 #23

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

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Pg 76 #23

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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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