A substance has a volume of 10.0 cm3 and a mass of 89 grams. What is its density?

0.11 g/cm3
8.9 g/cm3
99 g/cm3
79 g/cm3

Density =8.9g/cm³

Explanation:

Density is the mass per volume of a substance.

That is

Density = mass/volume

Given that mass = 89g

Volume  = 10cm³

Therefore

Density = 89/10 g/cm³

Density =8.9g/cm³

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elements make up everything, and they combine to make compounds.

the answer is c

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.