Do all crystals have the same internal arrangements?

What’s the percent by mass of carbon in c10h14n2

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!

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)