Question

помогииите

Answer 1

СaCo3+2HNO3=Ca(NO3)2+H2CO3

Answer 2

$CoCo _{3} +2HNO _{3} =Co(No3) _{2} +H _{2} Co _{3} \\ CoCo _{3}+2H+2No_{3} =Co+2No3+2H+Co _{3} \\ CoCo _{3}=Co+Co _{3}$