Which compounds give one singlet in the 1h nmr spectrum? ch3ch3 1461113dichloro22dibromo 1461123dimethyl2butene ch3―c≡c―ch3 ch2═chch═ch2 14611cyclohexadione 14611cyclopentane 14611123tribromopropane 14611ketone 14611ester

The answer is a) carbon-12

Heat capacity = mcδtheat capacity = 2.676×10^3 j ..the heat capacity given is for 7.00 g of kcn,potassium cyanide which is equal to 0. mole of mole = mass  ÷ mr of kcn is 7  ÷ 65 =0.therefore: 0. of kcn liberates 2.676×10^3 j of heat1 mole   (2.676×10^3    ÷  0.107 )  × 1 =do the calculation to obtain 25009 j = 25kj