# If 0.0250 mol of element Q has a mass of 1.742 g, what is the average mass of a mole of Q? Which element is Q?

The average mass of a mole (or molar mass) of an element Q is determined by taking the mass of 0.0250 mol, which in this case is 1.742 g, and dividing it by the number of moles, or 0.0250 mol. This produces an answer of 69.68 grams per mole (g/mol), which is the molar mass for element Q.

## If 0.0250 mol of element Q has a mass of 1.742 g, what is the average mass of a mole of Q? Which element is Q?

In order to determine what element Q is based on its molar mass, one needs to consult a periodic table of elements that lists each element’s atomic weight in g/mol and compare it to the calculated molar mass for element Q – 69.68 g/mol. Based on this comparison, we can deduce that Element Q is Bromine (Br). The atomic weight listed for Bromine on the periodic table ranges from 79-81 g/mol; since our calculation yielded a result lower than 79 g/mol but higher than 78 g/mol, we can infer with high confidence that Element Q must be Bromine (Br).

Bromine is classified as a halogen located in Group 17A within the Periodic Table and has an atomic number equal to 35; this means it contains 35 protons plus 36 neutrons within its nucleus surrounded by seven valence electrons in its outermost shell making up its chemical symbol Br2-. It has several unique properties such as being one of only two elements existing naturally as liquid at room temperature – chlorine being the other – and having both oxidizing and reducing properties when combined with other elements due to differences between electron affinities among them all leading to changes in oxidation states upon reaction occurances.. Furthermore, bromine can form bonds with many different types of molecules including alkanes like methane through substitution reactions replacing hydrogen atoms present on those molecules forming products such as methylbromide CH3Br or dimethylbromide C2H5Br etc depending on how many hydrogen atoms were replaced during these reaction processes respectively..

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