A sample of hydrogen is collected over water at 12 oC. The pressure of the hydrogen and water vapor mixture is 0.2atm. The hydrogen is then cooled, at the same volume, to 0 oC. What is the new pressure?

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It is sure ( overimitation)

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The reaction 2kalsi3o8 + 2(h+ + hco3-) + h2o  →  al2si2o5(oh)4 + 2k+ + 2hco3- + 4sio2 shows that feldspar kalsi3o8 is chemically altered by hydrolysis to form chalky-looking clay mineral kaolinite al2si2o5(oh)4. the chemical breakdown of potassium feldspar due to exposure to acidic water results to the mineral binding with the water molecule to become kaolinite with silica and potassium and bicarbonate ions in solution.