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$\rm a)\\C_M=\dfrac{\dfrac{14,6}{36,5}}{\dfrac{400}{1000}}=1(M)\\b)\\C_M=\dfrac{\dfrac{19,6}{98}}{\dfrac{500}{1000}}=0,4(M)\\c)\\C_M=\dfrac{\dfrac{12}{40}}{\dfrac{250}{1000}}=1,2(M)\\d)\\C_M=\dfrac{\dfrac{17,1}{171}}{\dfrac{800}{1000}}=0,125(M)$

$a)\\n_{HCl}=\dfrac{14,6}{36,5}=0,4(mol)\\400ml=0,4l\\C_{M_{HCl}}=\dfrac{0,4}{0,4}= 1(M)$

$b)\\n_{H_2SO_4}=\dfrac{19,6}{98}=0,2(mol)\\500ml=0,5l\\C_{M_{H_2SO_4}}=\dfrac{0,2}{0,5}=0,4(M)$ 

$c)\\n_{NaOH}= \dfrac{12}{40}=0,3(mol)\\200ml=0,2l\\C_{M_{NaOH}}=\dfrac{0,3}{0,2}=1,5(M)$

$d)\\n_{Ba(OH)_2}={17,2}{171}=0,1(mol)\\800ml=0,8l\\C_{M_{Ba(OH)_2}}=\dfrac{0,1}{0,8}=0,125(M)$