An isotope of an element has: more protons

less protons

a different atomic mass

the same number of neutrons

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.

List the path of the respiratory system

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.