How many Helium (He) gas molecules are present in a balloon with a volume of 1.5L at STP?

In order to calculate the amount of heat transferred you must know the __ and specific heat of the material, as well as the change in temperature. a. volume b. density c. mass d. enthalpy

Choose all the answers that apply. ionic compounds dissolve easily in water do not dissolve in water have low melting points have high melting points conduct electricity when melted

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