There are two naturally occurring isotopes of boron. B-10 has a mass of 10.01 amu with an abundance of 19.80 % and the isotope B - 11 has a mass of 11.01 amu with an abundance of 80.20%. What is the atomic mass of boron? (Show work to get full credit)

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?

The number at the end of an isotope’s name is the number.