Granite is an igneous rock that contains the minerals quartz, feldspar, mica and others. The exact composition will vary from sample to sample. Granite is a. Element b. Compound c. Heterogeneous mixture d. Homogeneous mixture/solution

Heterogeneous mixture

Explanation:

A mixture consists of two or more components that do not chemically react together. The components of a mixture retain their individual properties. A heterogeneous mixture contains many different components that do not chemical react together.

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.