Mendeleev predicted a new element would be discovered with a low melting point and a density of $$ 5.9 \frac{\mathrm{~g}}{\mathrm{~cm}^{3}} $$. Suppose you were the French chemist in 1875 who just isolated a new substance with a low melting point. Your sample's mass is 0.0428 kg and volume is $$ 7.3 \mathrm{~cm}^{3} $$. (Recall density = mass/volume). Calculate the density. Does your density match Mendeleev's prediction?

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The calculated density is approximately $$5.86 \frac{	ext{g}}{	ext{cm}^3}$$, which is close to Mendeleev's prediction of $$5.9 \frac{	ext{g}}{	ext{cm}^3}$$.

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