If food spoils is this a chemical or physical change?

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

How many moles of bromine are needed to produce 3.23 moles of potassium bromide