145.3 grams of Magnesium Oxide (MgO) decomposes and produces 32 grams Magnesium (Mg) and Oxygen gas
(O2). According to the law of conservation of mass, how
much Oxygen gas was produced?

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

the answer is 303.15 or 303

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l