Question 211597
the symbol for potassium is K (Na is sodium)


the density is given to 3 significant figures
___ calculating with more SF than 3 is counterproductive


39.1g/mol / 6.02x10^23atoms/mol = 6.50x10^-23g/atom


1.30E-22 g per unit cell


1.30E-22g / .856g/cm^3 = 1.52E-22cm^3 = 152E-24cm^3


taking cube root ___ 5.34E-8cm




there should be a root key on your calculator for whole number roots


using laws of exponents ___ cube root (x) = x ^ (1/3)