# Answer to Question #3078 in Physical Chemistry for Yasmine

Question #3078

The equation of reaction between potassium and water.

2K + 2H

Find the mass of potassium needed to produce 1.505 x 10

2K + 2H

_{2}O(1) --> 2KOH(aq) + H_{2 }Find the mass of potassium needed to produce 1.505 x 10

^{24}hydorgen molecule.Expert's answer

Let's find the amount of moles of H

1.505x1024/6.022 x 10

From the ballanced equation

2K + 2H

we can see that potassium has twice mol than H

v(H

The mass of the potassium is 39 g/mol/ * 5 mol = 195 g.

_{2}:1.505x1024/6.022 x 10

^{23}= 2.5 mol.From the ballanced equation

2K + 2H

_{2}O(1) -> 2KOH(aq) + H_{2}we can see that potassium has twice mol than H

_{2}.v(H

_{2}) = 5 mol.The mass of the potassium is 39 g/mol/ * 5 mol = 195 g.

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