Materials science What is the composition of NiO-MgO that can melt at 2400°C, but does not melt when placed in service at 2100°C? Use the corresponding diagram.
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You are asked to find the composition of a NiO-MgO mixture that melts at 2400°C but remains solid at 2100°C. This requires analyzing the phase diagram of the NiO-MgO system. Show more…
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What is the composition of NiO-MgO that can melt at 2400°C, but does not melt when placed in service at 2100°C? Use the corresponding diagram.
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The standard heat of formation for NiO(s) is -240 kJ/mol at 298 K. Write the formation equation for NiO(s) that goes with this value of ΔH°. Be sure to specify states. Write fractions with a slash, such as 1/2 for one half. If a box is not needed leave it blank. Using standard heats of formation, calculate the standard enthalpy change for the following reaction. CO2(g) + H2(g) → CO(g) + H2O(g) The following information is given for magnesium at 1 atm: boiling point = 1090 °C ΔHvap(1090 °C) = 131.8 kJ/mol melting point = 649 °C ΔHfus(649 °C) = 8.95 kJ/mol specific heat solid = 1.02 J/g°C specific heat liquid = 1.34 J/g°C What is ΔH in kJ for the process of freezing a 49.6 g sample of liquid magnesium at its normal melting point of 649 °C?
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Solid MgO, Liquid MgO Based on the diagram above, which of the following best helps to explain why MgO(s) is not able to conduct electricity? A: MgO(s) does not contain free electrons that can flow and conduct electricity. B: MgO(s) contains no water, but MgO(l) contains water that can conduct electricity. C: MgO(s) consists of separate MgO molecules held in a fixed lattice, while MgO(l) contains Mg2+ ions and O2- ions that can conduct electricity. D: MgO(s) consists of separate Mg2+ ions and O2- ions, but in MgO(l) the ions are free to move and conduct electricity.
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