1.) Water molecules H20 [molar mass M = 18 g/mol] can crystallize and form snowflakes by hydrogen bonding. A typical snowflake has mass m = 5.0 mg and diameter of about d = 6.0 mm. The binding energy of a hydrogen bond is Eg = 21 kJ/mol. On a sunny winter day, at temperatures below the freezing temperature Treeze = 0°C, a snowflake evaporates in about two minutes. a) Estimate the heat necessary to evaporate a snowflake! b) What is the intensity of sun light during that winter day? c) Find the magnitude of the electric field from the sun!

1.) Water molecules H20 [molar mass M = 18 g/mol] can crystallize and form snowflakes by hydrogen bonding. A typical snowflake has mass m = 5.0 mg and diameter of about d = 6.0 mm. The binding energy of a hydrogen bond is Eg = 21 kJ/mol. On a sunny winter day, at temperatures below the freezing temperature Treeze = 0°C, a snowflake evaporates in about two minutes. a) Estimate the heat necessary to evaporate a snowflake! b) What is the intensity of sun light during that winter day? c) Find the magnitude of the electric field from the sun!