Calculate the percentage composition for each of the...

Calculate the percentage composition for each of the following compounds (three significant figures).
a] NO
b $\mathrm{SO}_{3}$
c) $\mathrm{NaH}_{2} \mathrm{PO}_{3}$
d) $\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}$

Key Concepts

Percentage Composition

This concept involves calculating the mass percentage of each element in a compound by dividing the total mass of that element (in one mole of the compound) by the molar mass of the compound, then multiplying by 100. It gives insight into the relative amounts of each element present in the compound.

Molar Mass

Molar mass is the sum of the atomic masses of all atoms in a molecule, typically expressed in grams per mole. It is calculated by multiplying the atomic mass of each element by the number of times the element appears in the compound and then summing these values. This value is crucial for converting between grams and moles.

Chemical Formula Interpretation

Understanding a chemical formula involves reading the formula to determine which elements are present and in what proportions. It requires recognizing subscripts that indicate the number of atoms of each element within one molecule or formula unit, which is essential for calculating the molar mass and percentage composition.

Significant Figures

Significant figures refer to the precision of a measured or calculated quantity. When performing calculations such as percentage compositions, it's important to round the final answer to the correct number of significant figures to reflect the precision of the measurements and maintain consistency with the provided data.

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