How many grams of Iron (III) oxide (Fe2O3) can be produced from 25.0 g of iron and an excess of oxygen?
4 Fe + 02 - 2 Fe0g
moles of Fe
moles of Fe,03
grams of Fe2O3

answer; talc and gypsum;

catya your not at all which answer i've seen you do this on another question!

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