Answer
The correct answer is:
d) 498.44 amu
Work Step by Step
($Ca_3(C_6H_5O_7)_2$):
Given:
$Ca = 40.08$ $amu$
$C = 12.01$ $amu$
$H = 1.008$ $amu$
$O = 16.00$ $amu$
40.08* 3 + 2 * ( 12.01* 6 + 1.008* 5 + 16* 7 ) = 498.44g/mol