Tetraphosphorus decaoxide reacts with water to form phosphoric acid, a major ind

Question

Tetraphosphorus decaoxide reacts with water to form phosphoric acid, a major industrial acid. In the laboratory, the oxide is used as a drying agent. (a) What is the mass of 8.00 1022 molecules of tetraphosphorus decaoxide? (b) How many P atoms are present in this sample?

Explanation / Answer

P4O10 + 6H2O ------> 4H3PO4 i'm going to assume that's supposed to say what is the mass of 4.62 molec of P4O10 so, you are given the amount of particles, 8molec, and you are trying to find mass when you use dimensional analysis, all you have to do is: (8molec)(1 mol / 6.022e23 molec)(MM of P4O10 / 1 mol) you divide the molecules by 6.022e23 because there are that many molecules in a mol, and from there you multiply by molar mass of P4O10 you can work that out yourself :) 4 phosphorous atoms are in a formula unit of tetraphosphorous decaoxide hope that helps

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