How many moles of boron are in 37.8 grams of boron?

Asample of neon occupies a volume of 375 ml at stp. what will be the volume of neon if the pressure is reduced to 90.0 kpa? a. 422 ml b. 422 l c. 333 ml d. 333 l

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?