Table: azeotropes_2
Columns: 2nd_component
b_p_2nd_comp_c
3rd_component
b_p_3rd_comp_c
b_p_azeo_c

Question: Tell me the sum of bp 2nd comp with bp azeo of 57.5
SQL: SELECT SUM("b_p_2nd_comp_c") FROM azeotropes_2 WHERE "b_p_azeo_c" = 57.5