What volume of gas at STP is produced when 3.41 g of Mg is reacted with hydrochloric acid according to the following reaction?
Mg(s) + 2 HCl(aq) → MgCl2(aq) + Hz(9)

In 2002, the rare earth elements mine in mountain pass, california was closed because

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.

Use the de broglie's wave equation to find the wavelength of an electron moving at 4.5 × 106 m/s. show your work. note: h= plank's constant (6.62607 x 10-34 j s)