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21 August, 12:59

A student makes a compound of sulfur and oxygen. She uses 5.00 g of sulfur and 4.99 g of oxygen, and all of the elemental substances are completely used up. What is the percent sulfur in the compound?

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  1. 21 August, 13:24
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    First, we apply the law of conservation of mass which states that the total mass in a system remains constant.

    Therefore, there must be 5.00 g of sulfur and 4.99 g of oxygen in the product. Now, we determine the mass percentage using:

    Mass % = (mass of sulfur x 100) / total mass of compound

    Mass % = (5 * 100) / (5 + 4.99)

    Mass % = 50.05%

    The product contains 50.05% sulfur by mass.
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