We can use the general law of ideal gas: PV = nRT.

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where, P is the pressure of the gas in atm (P = 1.0 atm, Standard P).

V is the volume of the gas in L (V = ??? L).

n is the no. of moles of the gas in mol (n = 0.5 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 273 K, Standard T).

∴ V = nRT/P = (0.5 mol)(0.0821 L.atm/mol.K)(273 K)/(1.0 atm) = 11.21 L.

Sodium, like all the elements on that column have one valence electron. Valence electrons are the electrons found at the most outer shell of an atom. These are the electrons that do all the chemistry stuff. Oxygen on the other hand has six valence electrons. Adding just one sodium atom to an oxygen atom won’t create a stable bond( eight valence electrons). Sodium needs to lose one electron while oxygen needs to gain two. Therefore, by adding two sodiums( each transfers one electron to oxygen) to one oxygen, you get a stable bond and Sodium Oxide. I hope that this helps.

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mass of carbonic acid = 300g

molar mass of H2CO3 = 2H + C + 3 O

= 2 x 1.008+ 12.01 + 3 x 16

= 62.03g/mol

moles of H2CO3 = mass/Molar mass

= 300/62.03

= 4.8364 moles

1 mole H2CO3 has 3 moles Oxygen

4.8364 moles H2CO3 contains

= 3 x 4.8364 moles Oxygen = 14.509 moles Oxygen

moles = mass/Molar mass

mass of oxygen = moles x Molar mass of Oxygen

= 14.509 x 16

= 232.15g Oxygen

mass of oxygen in 300g of carbonic acid(H2CO3) = 232.15g

The Iron (III) ion is
The sulfate ion is 
Thus when forming the compound iron (iii) sulfate you would need three sulfate ions bonded to two iron ions in order to fill the valency requirement ∴ the formula would be Fe₂(SO₄)₃Whenever you are adding a number to a radical you must bracket it.