The relative formula mass of a compound with formula XS0, is 120. Calculate the ralative atomic mass of Y.
[Relative atomic mass: S, 32; 0, 16]

72

Explanation:

Relative atomic mass of YSO = Relative atomic masses of Y + S + O

This implies; Y + 32 + 16 = 120

Y = 120 - 48

Y = 72

Hence, the relative  atomic mass of Y = 72

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.