K:H:P:O = 1:2:1:4
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The chemical formula of the compound shows the ratio of the atoms of elements in a compound. This must not be confused with the ratio of their masses.
The ratio depends on the compound.
The ratio of elements depends on the context. Helium is the second most abundant common element in the universe (23% by mass) but in the earth's crust, it accounts for only 8 parts per billion. Conversely, silicon accounts for around 28% of the earth's crust but 0.07% of the universe.
Proust's law of constant proportions states that a given chemical compound always contains its component elements in fixed ratio (by weight). The ratio does not depend on its source and method of preparation.
There are many different alloys containing mainly copper, some tin and small amounts of other elements. There is, therefore, no precise answer. Generally, though, the ratio of copper to tin will be 997:3