4. The natural abundance for boron isotopes is 19.9% 10B and 80.1% 11B. Calculate boron's atomic mass
ion and show work completely.

Iknow #2 is d. i just need to know why

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?

Which of the following units is not an official si unit? mole liter kilogram ampere