Piece of plastic has a mass of 6.9 kg and a volume of 722 cm3. What is its density in g/cm3?

Explanation:

We want to find the density of the plastic in grams per cubic centimeter.

Density is found by dividing the mass by the volume.

We know the mass is 6.9 kilograms and the volume is 722 cubic centimeters We must convert kilograms to grams.

Now we know the mass and volume. Substitute the values into the density formula.  

Let's round to the nearest hundredth. The 6 in the thousandth place tells us to round the 5 to a 6.

The density of the plastic is about 9.56 grams per cubic centimeter

it would be d. henry moseley

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the answer is c. nacl