At constant temperature, a sample of helium at 760. mmhg in a closed container was compressed from 5.00 l to 3.00 l, with no change in moles or temperature. what was the new pressure exerted by the helium on its container?

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

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?

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5