Methane, CH_4, is a gas at room temperature but methodicalness CH_2Hl_2 in a liq

Question

Methane, CH_4, is a gas at room temperature but methodicalness CH_2Hl_2 in a liquid. Why? Water will rise up into a capillary tube. Why, and how is this phenomenons important in astute? Calculate the amount of beat in kj that is required to heart 20.0 g of ice from 25 degree C to 90 degree C, and sketch a heating curve for the process. The specific beat of ice 2.11 (i.g water 4.18 J/(g. degree C) and the Delta H_for water is 6.01 kJ/mol Calculate the amount of heat liberated when a 10.0 g of steam is converted to water at 75.0 degree C and sketch a cooling curve for the process. The specific heat of steam is 2.00 1. m.g) water are 4.18 J/(g, degree C) and the Delta H_vap for water is 40.6 kJ//mol.

Explanation / Answer

1) The intermolecular force of attraction in case of dichloromethane is more than that of methane. This is because in case of dichlorormethane due to the presence of electronegative chlorine molecule there do exist a dipole and diploe- diploe interaction among the molecules makes the dichlorormethane liquid. O the contrary methane is symetrical and is non polar and hence no such interaction is there and hence is a gas.

2) Wtaer rise up in a capillary tube this is because the strong force of adhesion between water and the wall of the tube rather than the force of cohesion among the water molecules.

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