Mercury specific heat

Chemical Designations - Synonyms. Calochlor Corrosive mercury chloride Corrosive sublimate Mercury bichloride Mercury (II) chloride Mercury perchloride Chemical Formula-. HgClj Observable Characteristics(as shipped)-. Solid Color. White colorless Odor. None. Physical and Chemical Properties - Physical State at 15 X and 1 atm. Solid Molecular Weight-. 271.50 Boiling Point at I atm. 576, 302, 575 Freezing Point 531, 277, 550 Critical Temperature Not pertinent Critical Pressure Not pertinent Specific Gravity 5.4 at 20 °C (solid) Vapor (Gas) Specific Gravity Not pertinent Ratio of Specific Heats of Vapor (Gas) Not pertinent Latent Heat of Vaporization Not pertinent Heat of Combustion Heat of Decomposition Not pertinent. 

Mercury has a specific heat of 0.140 J/g °C. Assume that a thermometer has 20 (2 significant figures) grams of mercury. How much heat is absorbed by the mercury when the temperature in the thermometer increases from 98.6°F to 103.2°F (Assume no heat loss to the glass of the thermometer.)... 

Soon after Dennison had deduced from the specific-heat curve that ordinary hydrogen gas consists of a mixture of two types of molecule, the so-called ortho and para hydrogen, a similar state of affairs in the case of iodine gas was demonstrated by direct experiment by R. W. Wood and F. W. Loomis.1 In brief, these experimenters found that the iodine bands observed in fluorescence stimulated by white light differ from those in the fluorescence excited by the green mercury line X 5461, which happens to coincide with one of the iodine absorption lines. Half of the lines are missing in the latter case, only those being present which are due to transitions in which the rotational quantum number of the upper state is an even integer. In other words, in the fluorescence spectrum excited by X 5461 only those lines appear which are due to what we may provisionally call the ortho type of iodine molecule. 

According to Yuill [29] the specific heat of mercury fulminate is ... 

The specific heat of a liquid increases with rise of temperature, except that.of mercury ( 2.VIII H), rubidium, and caesium, which decrease. The temperature coefficient a of Cp in. Ct=CQ+at(t°C. Cq at 0°C.) is almost the same for liquid and vapour. ... 

The effect of pressure on the specific heats of liquids is small.Lussana found for mercury (29° to 99° C.) and ethyl ether (60° C.) ... 

Direct measurements were made by Lussana, who drove the heated liquid under pressure by a pump into a calorimeter, or heated electrically the liquid under pressure. He found the effect of pressure small, and observed both increase and decrease of specific heat with increase of pressure (values for mercury calculated by Bridgman are included in the last three columns) ... 

De Keen attempted to find the effect of pressure up to and above the critical point, on the specific heat. A steel cylinder enclosing the liquid was surrounded by a jacket of mercury vapour, and the time taken for heating through 50° compared with that when water was in the cylinder. The accuracy of this method is doubtful. He found that the specific heat decreased with increasing pressure near the critical point, and there was a sudden change of specific heat at the critical temperature. With ether ... 

We can now make use of the data given above to calculate the specific heat of mercury and of turpentine. 

According to this table, the mean specific heat has a minimum at 37-5, and the true specific heat has a minimum at 25°. The specific heat of mercury decreases steadily, as the temperature rises, according to the linear equation ... 

Since as we have already seen, the heat capacities of solids can be accounted for theoretically, it is of interest to examine whether the heat capacities of liquids can also be predicted in a similar way. We observe in the first place, that in the neighbourhood of the melting point the specific heats of simple solids and liquids are generally nearly equal. J Thus for solid mercury at 234 c = 6 77 cal./deg. mole, while for... 

The density of mercury at 0 C and 1 atm. pressure is 13.595 g. oc.. Using the expression in Exercise 1, determine the work of expansion in ergs when the temperature of 100 g. of mercury is raised from 0 to 100 C at 1 atm. pressure. Given that the mean specific heat in this range is 0.0330 cal. deg. g. ", what proportion of the total amount of heat supplied to the mercury is the work of expansion ... 

Properties, — Indium is a white metal, softer than lead, easily malleable, ductile, crystalline, and diamagnetic. Its coefficient of expansion is 0.0000459, its specific heat 0.057, its compressibility ibti 25° 0,0000027, which is about two-thirds that of mercury. 

Mercury.—Let us consider, as the reaction, the evaporation of liquid and solid mercury, the atomic heats for which are well known. According to Kurbatoff, the heat of evaporation at 358° amounts to 13,600 per mol. On the assumption that the gas laws hold for mercury up to the boiling-point, and making use of the mean specific heat of liquid mercury determined by the same observer, the heat of evaporation of liquid mercury at 210 works out to... 

We shall see, however, that this value is some 2 per cent, too low. The deviation of saturated mercury vapour from the ideal gaseous state reduces its specific heat (cf. infra), and therefore increases A, on a rough estimate, by some 80 cals. Although the error still remaining appears inconsiderable in view of the difficulty of the measurement, it is sufficient to throw out the result we arc calculating by a large amount. 

Liquid metals are u ed for high-temperature heat transfer, espedally in nuclear reactors. Liquid mercury, sodium, and a mixture of sodium and potassium called NaK are commonly used as carriers of sensible heat. Mercury vapor is also used as a carrier of latent heat. Temperatures of 1500 F and above are obtainable by using such metals. Molten metals have good specific heats, low viscosities, and high thermal conductivities. Their Prandtl numbers are therefore very low in comparison with those of ordinary fluids. 

Bluish-white, very soft, inelastic, easily fusible, heavy metal leaves a streak on paper. Oxidizes superficially in air forming a coating of DjO Forms alloys with other metals and readily amalgamates with mercury, d 11.85. Bagins to volatilize at 174. mp 303.5°. bp 1457. Specific heat at 20° 0.031 cal/g/ C. Latent heat of fusion 5,04 cal/g. Brine ... 

The first of these tables gives the molar heat capacity at constant pressure of liquid and gaseous mercury as a function of temperature. To convert to specific heat in units of J/g K, divide these values by 200.59, the atomic weight of mercury. 

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