What will be the average density for a sample of metal with a mass of 12.6 g and volume calculations of 7.8 mL and 8.3 cm3 ? Omit units in the answer and report answer to one decimal place.

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To calculate average density, we need to divide the total mass of the sample by the sum of the volumes.

First, let's convert the volume measurements into a consistent unit. We can convert mL to cm³ by using the fact that 1 mL is equivalent to 1 cm³. Therefore, the volume of the sample is 7.8 cm³ + 8.3 cm³ = 16.1 cm³.

Now, we can calculate the average density:

Average Density = Mass / Volume

Mass = 12.6 g
Volume = 16.1 cm³

Average Density = 12.6 g / 16.1 cm³

Now, let's perform the calculation:

Average Density ≈ 0.78 g/cm³

Therefore, the average density of the sample is approximately 0.78 g/cm³.