The accurate relative isotopic masses and relative abundances of the isotopes in a sample of bromine are shown below.
Isotope
79Br
81BT
Relative isotopic mass
78.9183361
80.9162896
Relative abundance (%)
50.69
49.31
i.
What is the relative atomic mass of bromine in this sample?
Give your answer to three decimal places.

Both 1,2−dihydronaphthalene and 1,4−dihydronaphthalene may be selectively hydrogenated to 1,2,3,4−tetrahydronaphthalene. one of these isomers has a heat of hydrogenation of 101 kj/mol (24.1 kcal/mol), and the heat of hydrogenation of the other is 113 kj/mol (27.1 kcal/mol). match the heat of hydrogenation with the appropriate dihydronaphthalene.

As you watch a surfer ride a wave towards the shoreline, what is the shoreline? a) displacement reference b) reference point c) coordinate plane d) cartesian boundary

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?