Can someone help me answer these chemistry problems please??

Stoichiometry- i need with 14 and 15! an explanation would be appreciated!

What is the difference between skimming and absorbing methods of the oil removal

Find the enthalpy of neutralization of hcl and naoh. 87 cm3 of 1.6 mol dm-3 hydrochloric acid was neutralized by 87 cm3 of 1.6 mol dm-3 naoh. the temperature rose from 298 k to 317.4 k. the specific heat capacity is the same as water, 4.18 j/k g. a. -101.37 kj b. 7055 kj c. 10,1365 kj