The calculated yield for iron sulfide was 16.8 grams but the measured yield was 11.6 g what is the percent yield?
2febr3+3na2s=fe2s3 + 6nabr

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

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.