A32.2 g iron rod, initially at 21.9 c, is submerged into an unknown mass of water at 63.5 c. in an insulated container. the final temperature of the mixture upon reaching thermal equilibrium is 59 2 c what is the mass of the water? express your answer to two significant figures

Answer : The mass of the water in two significant figures is,

Explanation :

In this case the heat given by the hot body is equal to the heat taken by the cold body.

where,

= specific heat of iron metal =

= specific heat of water =

= mass of iron metal = 32.3 g

= mass of water = ?

= final temperature of mixture =

= initial temperature of iron metal =

= initial temperature of water =

Now put all the given values in the above formula, we get

Therefore, the mass of the water in two significant figures is,

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