A sample of ammonia has a mass of 89.9g. how many molecules are in this sample?

One of the few xenon compounds that form is cesium xenon heptafluoride (csxef7). how many moles of csxef7 can be produced from the reaction of 13.0 mol cesium fluoride with 12.5 mol xenon hexafluoride? csf(s) + xef6(s) csxef7(s)

What is the empirical formula for c4h8o2

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.