The value of Q is greater than that of P.
What is density?
The density of a substance is the ratio of the mass of the substance and its volume.
This can be mathematically expressed as:
Density = mass/volume.
For 100g iron with a density of 7.8:
Volume = mass/density = 100/7.8 =12.82 cm3
The mass of objects is always directly proportional to volume.
If 100g of iron has a volume of 12.82 cm3, it means that 200g of iron will have a volume of:
12.82 x 2 = 25.64 cm3
Density of 200g iron = 200/25.64 = 7.80 g/cm3 = P
This means the density of objects is irrespective of mass.
Thus, Q will also be 19.3 g/cm3.
In other words, the value of Q is greater than the value of P.
More on density can be found here: https://brainly.com/question/15164682
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