The mass of an unknown compound is found to be 75.4 g. The sample is found to contain 1.25 moles of the compound. i) Determine the molar mass of the substance. ii) Determine the number of molecules of the substance.

is has three carbons, so the answer is propylamine.

meth-

eth-

prop-

but-

pent-

hex-

hept-

oct-

non-

explanation:

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.