Use a proportion or dimensional analysis to determine the amount of energy (in kJ) needed to ionize 7.5 mol of sodium (Na(g)+496 kJ→Na+(g)+e-).

Calculate - analysis of compound composed of iron and oxygen yields 174.86 of fe and 75.14g of o. what is the empirical formula for this compound?

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.

Which metals are called noble metals