What element on the periodic table has a mass number of 50.9?

How is the Hvap used to calculate the mass of liquid boiled by 1 kJ of energy?

When 3.2g of ammonium chloride is dissolved in 75g of water, the temperature of the solution decreases from 22.8 C to 20.1 C. What is the energy of dissolution of NH4Cl per mole?

A gas cylinder contains 15 moles of 02. How many molecules of oxygen are in the cylinder

A balloon with a volume of 2.0 L at 25°C is placed in a hot room at 35°C. The pressure on the balloon is constant at 1.0 atm. What is the final volume of the balloon after it has been placed in the hot room?

Solve for V2 when P1 = 1.0 atm V1 = 22.4 L and P2 = 4.0 atm This is a Boyle's law gas problem

If an object mass is 50 g, and it's volume is 10 cubic cm, what is it's density

According to one acid-base theory, the H2O (l) molecules act as a ...

What does H2 stand for

How the model of an atom has changed over time because?

Which of the following conditions indicate a basic solution at 25°C? a. POH=11.21 b. pH=9.42 c. [OH-]>[H+] d. [OH]> 1.0 x 10^-7 M