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Answer to Question #3078 in Physical Chemistry for Yasmine

Question #3078
The equation of reaction between potassium and water.

2K + 2H2O(1) --> 2KOH(aq) + H2
Find the mass of potassium needed to produce 1.505 x 1024 hydorgen molecule.
Expert's answer
Let's find the amount of moles of H2:
1.505x1024/6.022 x 1023 = 2.5 mol.
From the ballanced equation
2K + 2H2O(1) -> 2KOH(aq) + H2
we can see that potassium has twice mol than H2.
v(H2) = 5 mol.
The mass of the potassium is 39 g/mol/ * 5 mol = 195 g.

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