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<p><b>Potassium + Oxygen</b>
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Potassium + Oxygen ➜ potassium oxide
4K(p) + O₂(g) ➜ 2K₂O(p)

19.5g of Potassium is heated fully in excess oxygen?
K is 39.1 g/mol
O is 16 g/mol
156.4 g of K + 32 g of O₂ ➜ 188.4 g of K₂O

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