How many milliliters of water at 25.0°C with a density of 0.997 g/mL must be mixed with 157 mL of coffee at 94.7°C so that the resulting combination will have a temperature of 56.9°C? Assume that coffee and water have the same density and the same specific heat (4.18 J/g·°C) across the temperature range.

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Which of the following units is not an official si unit