240 g of water (initially at 20°C) is mixed with an unknown mass of iron (initially at 500°C). When thermal equilibrium is reached, the system has a temperature of 42°C Find the mass of the iron.

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.

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The following gases at 298 k; cf4, nh3, sf6, so2.a) 0.069 atm