2. A sample of gas occupies a volume of 1.50L and has a pressure of 1.50atm. The gas expands and occupies a volume of 3.75L. What is the new pressure of the gas? Assume the temperature remains constant.

Calculate the change in entropy if br2(l) is converted to br2(g). s° for br2(l) = 152.2 j/(mol•k) s° for br2(g) = 245.5 j/(mol•k) s° for br(g) = 175.0 j/(mol•k)

What’s the scientific notation for the number 6,840,000,000

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?