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- When the oxide of generic metal M is heated at 25.0 C, a negligible amount of M is produced. MO,(s) = M(s) + 0,(g) AG = 291.0 mol When this reaction is coupled to the conversion of graphite to carbon dioxide, it becomes spontancous. What is the chemical equation of this coupled process? Show that the reaction is in equilibrium. Include physical states and represent graphite as C(s). chemical equation: What is the thermodynamic equilbrium constant for the coupled reaction? K =Define isotropy and anisotropy with respect to material propertiesThe amount of oil and grease from the rivers beside mining sites are quantified by solvent-solvent extraction. The dissolved oil and grease from the organic solvent will then be dried and weighed. What type of gravimetry is described by the statement? O precipitation gravimetry O physical gravimetry thermogravimetry electrogravimetry
- A geochemist in the field takes a small sample of the crystals of mineral compound X from a rock pool lined with more crystals of X. He notes the temperature of the pool, 17.° C, and caps the sample carefully. Back in the lab, the geochemist dissolves the crystals in 4.00 L of distilled water. He then filters this solution and evaporates all the water under vacuum. Crystals of X are left behind. The researcher washes, dries and weighs the crystals. They weigh 0.080 kg. Using only the information above, can you calculate the solubility of X in water at 17.° C ? If you said yes, calculate it. Be sure your answer has a unit symbol and the right number of significant digits. O yes O no 0 0 x10 ロ･ロ x 3 00 5calculate the values of ASxn for each reaction at 25 °C.In biological cells that have a plentiful supply of oxygen, glucose is oxidized completely to CO2 and H2O by a process called aerobic oxidation. Muscle cells may be deprived of O2 during vigorous exercise and, in that case, one molecule of glucose is converted to two molecules of lactic acid (CH3CH(OH)COOH) by a process called anaerobic glycolysis. (a) When 0.3212 g of glucose was burned at 298 K in a bomb calorimeter of calorimeter constant 641 J K−1 the temperature rose by 7.793 K. Calculate (i) the standard molar enthalpy of combustion, (ii) the standard internal energy of combustion, and (iii) the standard enthalpy of formation of glucose. (b) What is the biological advantage (in kilojoules per mole of energy released as heat) of complete aerobic oxidation compared with anaerobic glycolysis to lactic acid?
- 1. Which, if any of the following, constitute a closed system?(a) A sealed container in which a chemical reaction occurs.(b) A dog.(c) An open beaker in the lab, in which a reaction occurs.(d) A mixture of gases inside a sealed impenetrable balloon. 2. What is the definition of an isolated system? How could you approximate anisolated system in the lab?A steel block of mass 6.2 kg is originally at a temperature of 25°C and 1 atm. It is then heated to a temperature of 60°C without any change in pressure. The specific heat of steel is 452 J/(kg · °C), its density is 7.85 x 103 kg/m3, and the coefficient of linear expansion is 12 x 10 -6/°c. (a) Determine the work done by the steel block. (b) How much heat energy is transferred during this process? (c) What is the increase in internal energy of the system?The pressures deep within the Earth are much greater than those on the surface, and to make use of thermochemical data in geochemical assessments you need to take the differences into account. (a) Given that the enthalpy of combustion of graphite is -393.5 kJ mol-1 and that of diamond is -395.41 kJ mol-1, calculate the standard enthalpy of the C(s, graphite) → C(s, diamond) transition. (b) The densities of graphite and diamond are 2.250 g cm-3 and 3.510 g cm-3 , respectively. Calculate the internal energy of the transition when the sample is under a pressure of 150 kbar.
- When a metal is heated its density decreases. There are two sources that give rise tothis diminishment of : (1) the thermal expansion of the solid, and (2) the formation of vacancies. Consider a specimen of gold at room temperature that has a density of 19.320 g/cm3.(a) Determine its density upon heating to (800°C) when only thermal expansion is considered.(b) Repeat the calculation when the introduction of vacancies is taken into account. Assume that the energy of vacancy formation is 0.98 eV/atom, and that the volumecoefficient of thermal expansion, is equal to 3 αlA geochemist in the field takes a 9.0 mL sample of water from a rock pool lined with crystals of a certain mineral compound X. He notes the temperature of the pool, 15. C, and caps the sample carefully. Back in the lab, the geochemist first dilutes the sample with distilled water to 400. mL.. Then he filters and evaporates all the water under vacuum. Crystals of X are left behind. The researcher washes, dries and weighs the crystals. They weigh 0.045 g. Using only the information above, can you calculate the solubility of Xin water at 15.° C7 If you said yes, calculate it. Be sure your answer has a unit symbol and 2 significant digits. yes O no 0 0.9 H ロ･ロ X 0 GHow long would it take for 1.50 mol of water at 100.0 °C to be converted completely into steam if heat were added at a constant rate of 16.0 J s1? Express your answer to three significant figures and include the appropriate units.
