Question

x is any substance having Am 39u . find no of unit cells in 2g of it.

Answer 1

atomic mass of an element of atomic no 18 that is argon. and 1mole of argon is 18 gram
there for 1 gram of argon = 1/18 mole
lly, 2gm of argon= 2×1/18=1/9 mole of argon
.......... i.e. (6.022×10^23)/9