Description
In a careful experiment, a chemist burns 15.4 kg of wood in a fireplace. The chemist collects all of the substances produced by the fire. He measures the mass of ash produced to be 925 g, mass of carbon dioxide is 15.14 kg, and the mass of water produced to be 3.12 kg. How much oxygen was used up by the wood while it burned?
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Explanation & Answer
The law of conservation of mass says that the mass of the products is equal to the mass of the reactants.
wood + oxygen = ash + carbon dioxde + water
15.4 kg + oxygen = 0.925 kg + 15.14 kg +3.12 kg
15.4 kg + oxygen = 19.185 kg
oxygen = 3.785 kg
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