Calculate the mass fraction of copper in a brass sample obtained by fusing 17.5 g of zinc with 32.5 g of copper.

Mass fraction in percent is the ratio of the mass of the component to the total mass of the sample (solution, etc.), multiplied by 100%. D A (%) = (m A / m total) * 100%.
In a brass alloy sample, D Cu (%) = 32.5: (17.5 + 32.5) * 100% = 32.5: 50 * 100% = 65%.

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