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The density of osmium, which is the densest metal, is 22.57g/cm3. What is the mass of a block of osmium that measures 1.00cm x 4.00cm x 2.50cm? Show your work. (3pts) Hint: Density = Mass ÷ Volume, so Mass = Density x Volume and the volume of a rectangle or block = Length x Width x Height.

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W0lf93
226 grams.  
First, let's calculate the volume of the block. 
1.00cm * 4.00cm * 2.50cm = 10 cm^3  
Now you multiple by the density. So: 
10 cm^3 * 22.57 g/cm^3 = 225.7 g  
So the mass of the block of osmium is 225.7 grams. But since we only have 3 significant figures in our least precise piece of data (the dimensions of the block), the result should be rounded to 3 significant figures, giving 226 grams.