What volume of a 3.5%w/v NaCl solution can be prepared from 30 g of NaCl?

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

i would say b

explanation:

but i think i would need more information than that

the temperature of the gas, in k, not celsius.