Verified Answer :

Kalahira

Solving for the formula mass of calcium nitrate:
Atom | Atomic Mass
Ca | 1 x 40.08 = 40.08
N | 2 x 14.01 = 28.02
O | 6 x 16 = 96
FM = 164.10 amu
Solving for the percent:
%O2 = mass of oxygen / mass of compound x 100%
%O2 = 96 amu / 164.10 amu x 100%
%O2 = 58.50% or 59%

Oseni

The percent composition by mass of oxygen in \(Ca(NO_3)_2\) will be 58.54%

Percent composition by mass

The percent composition by mass of a compound is mathematically given by:

Percent composition by mass = mass of component/total mass x 100

In this case, there are 6 atoms of oxygen in the compound.

6 x 16 = 96 g/mole

Percent composition by mass of oxygen = 96/164 x 100 = 58.54%

More on percentage composition can be found here: https://brainly.com/question/1350382

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