The answer for this one is a
Explanation:
The idea here is that you need to use the Periodic Table of elements to find the mass number of the most common isotope of phosphorus, P.
The idea is to foretell the formation of a carbonyl compound by the reaction between alcohol and too much pyridinium chlorochromate. An oxidizing agent called pyridinium chlorochromate converts the alcohol group into the 1carbonyl group.
The carbonyl molecule that results from the reaction will depend on the reactant's OH group. Pyridinium chlorochromate [PCC] converts primary OH to aldehydes, whereas it converts secondary OH to ketones, and oxidation of tertiary OH has little effect. Alcohols and pyridinium chlorochromate [PCC] react to create a carbonyl molecule.
From primary alcohols to aldehydes and from secondary alcohols to ketones, pyridinium chlorochromate oxidizes alcohols one step up the oxidation ladder. pyridinium chlorochromate will not oxidize aldehydes to carboxylic acids, in contrast to chromic acid. Comparable to Pyridine (the Collins reagent) and CrO3 will both oxidize primary alcohols to aldehydes. Here are two instances of pyridinium chlorochromate being used.
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<h2>The grams of the excess reactant that are left at the end of reaction is</h2><h2>= 1.2014 grams</h2>
<h3>calculation</h3>
find the moles of each reactant
moles = mass/molar mass
molar mass of Ga= 69.7 g/mol
molar mass of As= 74.9 g/mol
mole of Ga = 4 g÷69.7 g/mol=0.05739 moles
moles of As=5.50 g÷74.9 g/mol =0.07343 moles
0.05739 moles of Ga reacted completely with 0.05739 moles of As therefore As was in excess
Therefore the moles of As that did not react = 0.07343 - 0.05739=0.01604 moles
mass that did not react = moles that was left x molar mass of As
that is; 0.01604 x 74.9=1.2014 grams
