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13 November, 08:01

Saltpeter is a compound made of potassium (K), nitrogen (N), and oxygen (O). Every 100.0g of saltpeter contains 38.67g potassium and 13.86g nitrogen. What is the mass of oxygen contained in 285.0mg of saltpeter? Answer needs to be in grams

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  1. 13 November, 08:23
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    Use a proportion ...

    100.0g - 38.67g - 13.86g = 47.47g Oxygen

    285.0 mg = 0.285g

    47.47/100 = x/0.285g

    x = (47.47/100) X 0.285g
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