NEED HELP How many mole is in 50.0 kg of cobalt metal?

Working with si (metric) units for each of the following commonly used measurements, indicate its symbol. liter gram milliliter kilogram meter centigram milligram centimeter kilometer second millimeter milliseconds

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

How do you know when a chemical reaction has occurred