Given the thermochemical equation: 2SO2(g) + O2(g)!2SO3(g), ΔH°rxn= –198 kJ/mol, how much heat is evolved when 375. g of SO3 (80.1 g/mol) is formed?

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.

c.

explanation:

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b