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)

You are performing an experiment in a lab to attempt a new method of producing pure elements from compounds. the only problem is that you do not know what element will form. by your previous calculations you know that you will have 6.3 moles of product. when it is complete, you weigh it and determine you have 604.4 grams. what element have you produced?

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

Anurse used a 0.02-mg/l solution of disinfection to clean a patients wound. what is the concentration of the solution expressed as a percentage?