Question

A particular compound in the chemistry laboratory is found to contain 7.2×10247.2 \times 10^{24} atoms of oxygen, 56.0 g56.0 \mathrm{~g} of nitrogen, and 4.04.0 moles of hydrogen. What is its empirical formula?

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The determination of the empirical formula of a compound can be made by collecting (through instrumental techniques) the relative masses of the elements that form this compound and the mass of the sample. If we multiply the relative mass of the element by the atomic mass of the element, we will obtain the number of moles of this element. The equivalence statement between mass and number of moles is:

1 mol=atomic mass (g) of the element\text{1 mol}=\text{atomic mass (g) of the element}

The ratio of the elements in a binary compound can be found by analyzing the ratio of the moles of the elements.

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