Answer
$P-H: \ estimated\ 1.38\ measured\ 1.419$
$As-H: \ estimated\ 1.50\ measured\ 1.519$
$Sb-H: \ estimated\ 1.70\ measured\ 1.707$
Work Step by Step
The figure shows the following atomic radii:
H=0.31, P=1.07, As=1.19, Sb=1.39
The computed/estimated bond distances are therefore:
$P-H: 1.07+0.31=1.38$
$As-H: 1.19+0.31=1.50$
$Sb-H: 1.39+0.31=1.70$
