Although mass is a property of matter we can conveniently measure in the laboratory, the coefficients of a balanced chemical equation are not directly interpreted on the basis of mass. explain why.

The coefficients of a balanced chemical equation means number of particles (molecules or unit formulas) not mass.

The law of definite proportion states that a compound is constituted by the same elements in the same proportion regardless the total amount.

A chemical formula states the ratio of the atoms in a compound as number of atoms, not as mass or weight.

For example, the formula Na₂O means that the compound is formed in a ratio of 2 atoms of Na to 1 atom of O. (Not two grams of Na to one gram of O).

Then, the chemical equation Na + O₂ → Na₂O when balanced results in

4Na + O₂ → 2Na₂O.

The coefficients are used to balance the number of atoms in the compounds of each side: 4 atoms of Na in the reactant side and 4 atoms of Na in the product side, 2 atoms of O in the reactant side and 2 atoms of O in the reactant side.

So, the coefficients mean number of unit formulas, not mass.

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

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noun

the practice of taking someone else's work or ideas and passing them off as one's own.

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