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Question

0.242 g sample of K is heated in the presence of oxygen gas. This resulted in the formation of 0.440 g of a crystalline compound. What is the formula of this compound?


Solution

The correct option is D
xK+yO2product
Amount of O2 used = 0.440 - 0.242 = 0.198g
Moles of O2 = 0.198326.2×103
Moles of K = 0.242396.2×103
Hence, it can be concluded that 1 mol of K reacts with 1 mol of oxygen and the formula of the product is KO2.

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