How many Pb and Kr atoms are there in Pb9(Al5Kr7)4?
can anyone help mwe? i needs help :(

Pb = 9

Kr = 28

Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements

In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison

Compounds can be formed from several elements, which can be the same or not .

The composition of the constituent elements is usually expressed in subscript

For compound : Pb₉(Al₅Kr₇)₄

The number of Pb atoms = 9

The number of Kr atoms = 7 x 4 = 28

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