Element X has two naturally occurring isotopes . Its first isotope has a mass of 28.0 amu and a natural abundance of 64.24%. Its second isotope has a mass of 25.0 amu. What is the atomic mass of element X?

Si una estrella no tiene paralaje medible, ¿qué puedes inferir?

How does the value of the equilibrium constant show that a reaction reaches equilibrium very quickly? (a) the equilibrium constant is large. (b) the equilibrium constant is small. (c) the equilibrium constant is zero. (d) the value of the equilibrium constant does not show how quickly a reaction comes to equilibrium.

The following questions a24 - a26 relate to 100 ml of 0.0150 m solution of benzoic acid (c6h3cooh). ka(c6h3cooh) = 6.4 x 10^-5. what is the ph of the solution after the addition of 1 x 10^-3 moles of naoh? you may assume no volume change to the solution upon addition of the naoh.