An analysis of aspirin determined that aspirin contains carbon, hydrogen and oxygen. What is the empirical formula given that the following quantities were
present: 30.0 g C, 2.24 g H and 17.76 g O.
You won't be able to enter subscripts, so just enter the number where it goes.
For example, S203.
Your formula should have the following order of atoms: CHO

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

the answers would be

the first one and the second one

the answer would be a