1. fill one container with very hot water and the other with ice water. 2. place one end of spoon into the cup with hot water and hold on to the other end with your finger tips. 3. hold the spoon for a minute or two. what do you feel happening?

The spoon will get warmer as it takes in the heat of the water

Answer : The mass of  added must be, 61.9 grams

Explanation : Given,

Mass of = 40 g

Molar mass of = 105.9 g/mol

First we have to calculate the moles of .

Now we have to calculate the moles of

The balance chemical reaction will be:

From the balanced reaction we conclude that

As, 1 mole of react with 1 mole of

So, 0.378 mole of react with 0.378 mole of

Now we have to calculate the mass of

Molar mass of = 164 g/mol

Thus, the mass of  added must be, 61.9 grams