Most certainly it means: Oxygen molecules ( O2 ) in gaseous state ( O2,g or (O2)g )
Note: the letter 'g' should be in subscripted undercase (not Capitalised!)
That's a decomposition reaction. One reactant, two (or more) simpler products.
Calcium (Ca) is element. O2 and CaO are molecules.
More No will be produced
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The coefficient for carbon dioxide in the balanced equation C5H12I + 8 O2 -> 5 CO2 + 6 H2O is 5.
In:(H2)g oxidation state: 0 In:(O2)g oxidation state: 0 In:(H2O)l oxidation state: H: +1 and O: -2
Moles of O2=2.5/32=0.078125 Moles of He=6.4/4=1.6 Mole fraction of O2=0.078125/(0.078125+1.6)=0.046555 Partial pressure of O2=0.046555 x 8.25=0.384atm
The reaction represented by H₂O → H₂(g) + O₂(g) is a decomposition reaction. In this reaction, water (H₂O) is broken down into its constituent elements, hydrogen gas (H₂) and oxygen gas (O₂), typically through the process of electrolysis or thermolysis. Decomposition reactions involve the separation of a compound into simpler substances.
The reaction ( 2 \text{H}_2(g) + \text{O}_2(g) \rightarrow 2 \text{H}_2\text{O}(g) ) represents the combustion of hydrogen gas in the presence of oxygen gas to produce water vapor. This is an exothermic reaction, meaning it releases energy, typically in the form of heat and light. It is also a redox reaction, where hydrogen is oxidized and oxygen is reduced.
In the balanced chemical equation 4 Cr(s) + 3 O2(g) → 2 Cr2O3(g), there are a total of 6 chromium atoms (2 from Cr and 4 from Cr2O3) and 6 oxygen atoms (6 from O2 and 3 from Cr2O3) on the right side of the equation.
Both H2O2I and H2OI O2 are unknown compounds, chemically speaking even the first looks rather impossible to me. However HO2I and HOI (with 1 i.s.o. 2 H atoms) are real compounds, when correctly written as HIO2 and HIO they are commonly known as Iodic and hypo-Iodic acid. Doing so, the reaction 2 HIO2 --> 2 HIO + O2(g) is called an 'auto-redox decomposition' or an 'internal oxidation-reduction' reaction.