Tonium (T) has a molar mass of 210.0 g/mol and Changston (Ch) has a molar mass of 55.0 g/mol. The molar mass of TCh₂ is 320.0g/mol. What is the percent by mass of T?

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.