In a reaction, 3.78g of iron metal is reacted completely with excess sulfur to produce only one product, a compound that weighs 5.95g. What is the empirical formula of this compound

The empirical formula is

Explanation:

Mass of Fe = 3.78 g

Mass of S = (5.95-3.78) g = 2.17 g

Step 1 : convert given masses into moles.

Moles of Fe =

Moles of S =

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For Fe =

For S =

The ratio of Fe : S= 1: 1

Hence the empirical formula is

the answer is barium and copper bromide

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