Which famous scientist unknowingly founded the field of spectroscopy?
a. albert einstein
b. isaac newton
c. galilieo
d. george hale
(if anyone has the unit 6 lesson 9 unit test for science id like the answers)

The correct answer is the b=Isaac Newton

Explanation:

Hello! We will answer this!

Newton was the first to study spectroscopy. First, he believed that the prism was responsible for white light being able to decompose in monochromatic beams.

Then he could prove that the prism could only separate the beams that were emitted by a source.

The correct answer is the b=Isaac Newton

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.