Consider the unit cell of aluminum with aluminum ion on every corner and every face-centered site of the cube.
question
1. using the value of ionic radius of aluminum ion r=0.143 nm, the length of each edge of the unit cell can be calculated as what nm?
2.using atomic weight value of aluminum 27.0, the density of aluminum can be calculated as what g/cm^3

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ