KF has NaCl structure. If the distance between K^+ and F^- is 269 pm, find the density of KF (N_A=6.02 xx 10^23 mol^(-1), atomic masses K=39, F = 19 amu)

KF has NaCl structure. If the distance between K^+ and F^- is 269 pm,

1.	KF has NaCl structure. If the distance between K^+ and F^- is 269 pm, find the density of KF (N_A=6.02 xx 10^23 mol^(-1), atomic masses K=39, F = 19 amu)
Answer» ANSWER :`2.48 " G CM"^(-3)`